The radius is the length from the … To calculate the area, you just need to enter a positive numeric value in one of the 3 fields of the calculator. Finally, you can find the diameter - it is simply double the radius: D = 2 * R = 2 * … A diameter of a circle is defined as a straight line passing from one side to another side through the center point. Just enter the value of the circumference. The area of a circle is A = pi multiplied with r² and the circumference is U = 2 multiplied with pi multiplied with r , in which pi is the circle … In more exact words, it is the segment of a straight line that passes through the center of the circle and ends where it touches two points on the circle. Use the this circle area calculator below to find the area of a circle given its diameter, or other parameters. Use the this circle area calculator below to find the area of a circle given its diameter, or other parameters. Circle Calculator. Area and circumference of circle calculator uses radius length of a circle, and calculates the perimeter and area of the circle. The formula used to calculate the circle diameter is: Enter the area contained within a circle. Given the radius or diameter and pi you can calculate the circumference. π = 3.142 Easily Find The Area Of A Circle (And Related Use Cases). Calculate the area of a circle from a diameter measured in metres with results in square metres, hectares and acres. You can enter the radius and then compute diameter and circumference in mils, inches, feet, yards, miles, millimeters, centimeters, meters and kilometers.. Area has different units, but you can use: square mils, square inches, square feet, square yards, square miles, acres, hectares, square millimeters, square centimeters, square … Formula and explanation, description, conversion. Circle calculator. πr 2 = π*(D/2) 2 = πD 2 /4 The radius can be any measurement of length. Use this easy and mobile-friendly calculator to compute the area of a circle given its diameter. Area = pi * (diameter/2)*(diameter/2) Area = (1/4)* pi * d 2. Essentially, the diameter is twice the radius – or any line that goes from one side of the circle to the other while crossing its center. We can also calculate the area directly using diameter. Enter the circle radius, diameter, circumference, or area and it will solve for the other three! The radius is half of the diameter. Our circle area calculator, requires diameter OR radius of a circle to calculate area of a given circle. Our circle area calculator is used to find the area of a circle given its radius, diameter or circumference. The radius is the distance … To calculate the area, you just need to enter a positive numeric value in one of the 3 fields of the calculator. A circle is a shape with all points at the boundary having the same distance to the centre. All you have to do is enter the price per unit area and voila, you have the total cost of materials in a single click! The radius, the diameter, and the circumference are the three defining aspects of every circle. It is an online Geometry tool requires radius length of a circle. Given any one variable A, C, r or d of a circle you can calculate the other three unknowns. radius r diameter R; area S . This circumference to diameter calculator is used to find the diameter of a circle given its circumference. The area of a circle is A = pi multiplied with r² and the circumference is U = 2 multiplied with pi multiplied with r , in which pi is the circle constant (approximately 3,14). Estimate of Circle's Area = 80% of Square's Area = 80% of 9 = 7.2 m 2 Circle's True Area = ( π /4) × D 2 = ( π /4) × 3 2 = 7.07 m 2 (to 2 decimals) The estimate of 7.2 m 2 is not far off 7.07 m 2 The area of a circle calculator helps you compute the surface of a circle given a diameter or radius. All you need is another variable to get the other three and solve the problem immediately. Find the area with this circle area formula: Multiply Pi (3.1416) with the square of the radius (r) 2. Find the area with this circle area formula: Multiply Pi (3.1416) with the square of the radius (r) 2. What we need to calculate is the radius and diameter. It supports different units such as meters, feet, and inches. Area of a Circle = π x (Diameter/2)^2 Just enter the area value in the input field and click calculate in this Diameter of a circle from area calculator to find the result. For the sake of understanding, we will solve the previous example using the formula of a diameter. Roofing contractors can use a simple geometry and online calculators to figure out a roof area an... © 2021 Square Footage Area, All rights reserved. How to Find the Area of a Semicircle To find the area of a semi-circle, you need to know the formula for the area of a circle. FAQ. The area of a circle is: The radius can be any measurement of length. Learn more about pi, or explore hundreds of other calculators addressing finance, math, … 2. Questionnaire. Calculates the area and circumference of a circle given the radius or diameter. Get the result. Hence the area of a semi-circle is just the half of the area of a circle. Essentially, this variable can be defined as the distance around the circle or the entire length of the circuit along the circle. It can be also used to calculate other parameters of a circle such as diameter, radius and area. The straight from any point to another through the the center point is called the diameter. Whether you are in class solving a math test or need an accurate calculation about the area of a circle for a project that you are building, the formula for area of a circle is simple – but not that simple when you are left with a pen and paper. Calculating a circle's diameter is easy if you know any of the other dimensions of the circle: the radius, the circumference, or the area. The calculations are done "live": How to Calculate the Area. The diameter will always pass through the center of the circle. Just type into the box and your conversion will happen automatically A circle is a simple closed shape in Euclidean geometry. The diameter will always pass through the center of the circle. FAQ. Circle Area Calculator. Determine the radius of a circle. Circumference calculator is a free tool used to calculate the circumference of a circle when the radius is given. circumference L . Compute the area using these units: square mils, square inches, square feet, square yards, square miles, acres, hectares, square millimeters, square centimeters, square meters, and square kilometers. Things You Need To Take Care About Measuring An Area Of A Circle. Circle calculator. Enter the radius, diameter, circumference or area of a Circle to find the other three. Circle Area Calculator. Area of a circle in square metres = (Diam ÷ 2)² * 3.14159 Example: Circle with a diameter of 30 metres 30 ÷ 2 = 15 * 15 * 3.14159 = 706.858 square metres In the result you will get all unknown variables presented. Circle Equation Calculator: This calculates the equation of a circle from the following given items: * A center (h,k) and a radius r * A diameter A(a 1 ,a 2 ) and B(b 1 ,b 2 ) This calculates the area as square units of the length used in the radius. Then tap or click the Calculate button. The distance around a circle (i.e) its perimeter gives you the circumference. Diameter (drop down ft, in, yd, cm, mm, m) Area = 3.1416 x r 2. Can calculate area, arc length,chord length, height and perimeter of circular segment by radius and angle. What is the diameter of circle with radius 20 feet? This is the diameter of a circle that corresponds to the specified area. radius r diameter R; area S . D=2r. Get the result. circumference L . It supports different units such as meters, feet, and inches. 4. Since the diameter of the circle is equal to twice the radius, by simple substitutions we obtain that the area of the circle is equal to the quart of the product of the square of the diameter and the number pi (π = … Yes, our tool is that awesome. Area of a circle [1-10] /34: Disp ... To improve this 'Area of a circle Calculator', please fill in questionnaire. Area of a circle formula The formula for the area of a circle is π x radius2, but the diameter of the circle is d = 2 x r 2, so another way to write it is π x (diameter / 2)2. Male Female Age Under 20 years old 20 years old level Answer = (π x (Diameter/2)^2) square area It is an online Geometry tool requires radius length of a circle. You can calculate the area of the circle border in square feet, in square inches, square yards, square centimetres, square millimetres and square meters. Area of a Circle Calculator Area of a circle is simply, number of square units fit into a circle. This geometry calculator will take one known circle measurement (area, circumference, diameter, or radius) and calculate the other three. This circumference to diameter calculator is used to find the diameter of a circle given its circumference. To calculate the area, you just need to enter a positive numeric value in one of the 3 fields of the calculator. Circumference to Diameter Calculator. To the rescue is Circle Calculator. Divide the area (in square units) by Pi (approximately 3.14159). Measuring the diameter is easier in many practical situations, so another convenient way to write the formula is (angle / 360) x π x (diameter / 2) 2. You can put this calculator widget on your website, web page or blog. Just enter the measurement you know. π = 3.142 The diameter is the distance from one side of the circle to the other at its widest points. Sphere volume to diameter calculator; Sphere surface area to diameter calculator; User Guide. The following formulas are used for circle calculations. Mathematical, algebra converter, tool online. Area and circumference of circle calculator uses radius length of a circle, and calculates the perimeter and area of the circle. Just input the circumference value in the input field and the diameter of a circle from circumference calculator will automatically update you with the circle diameter. Solve the Common Geometry Problem Today With Our Area Of A Circle Calculator. As you might be aware, there are two major systems for measuri... Roofing is measured in squares. Substitute this value to the formula for circumference: C = 2 * π * R = 2 * π * 14 = 87.9646 cm. Just enter the measurement you know. Use this calculation to calculate the area of a circle. Formula. To find out the area of a circle border, we need to know its inner diameter and the width of the circular border. The π (pi) variable is basically a constant which cannot be expressed as a fraction but applies to all calculations – including the area of a circle calculator – whereas the √ (square foot) is basically the total surface within a circle. Our area of circl calculator lets you easily find the area, circumference, radius or specific diameter of any circle. The diameter should be measured in feet (ft) for square footage calculations and if needed, converted to inches (in), yards (yd), centimetres (cm), millimetres (mm) and metres (m). Price per unit (drop down ft2, in2, yd2, cm2, mm2, m2). A circle is the set of all points in a plane at a fixed distance, called the radius, from a given point, the centre. You can use numerous different inputs and choose to submit the radius, the diameter or the circumference of the circle. Visual on the figure below: thus r= D/2, substitute the same in the Area of Circle formula i.e. Customer Voice. Formula and explanation, description, conversion. A circle of radius = 8 or diameter = 16 or circumference = 50.27 units has an area of: Use the this circle area calculator below to find the area of a circle given its diameter, or other parameters. How to find the circumference of a circle. Circle diameter to radius calculator; Convert an area to different units; Length and distance converter; Sphere diameter to volume calculator; Sphere diameter to surface area calculator; User Guide. Our tool works both ways - no matter if you're looking for an area to radius calculator or a radius to the area one, you've found the right place Radius of circle r = 20 feet. Just type into the box and your conversion will happen automatically Using Radius to Find Area Identify the radius of a circle. Formulas for calculating the area of a circle. Using this calculator, we will understand methods of how to find the perimeter and area of a circle. Area = 3.1416 x r 2. Plus, unlike other online circle calculators, this calculator will show its work and give a detailed, step-by-step explanation of the … If you want to know how to calculate the diameter of a circle, just follow these steps. What is the area of a circle with a DIAMETER of 120 cm (radius of 60 cm)? A circle is set of all points in a plane that are at a given distance from the centre. Circles are complex shapes. The age-old conundrum, why do we need two systems of measurements? Here you can calculate the area, diameter, circumference of a circle and also area … Questionnaire. Area of a circle [1-10] /34: Disp ... To improve this 'Area of a circle Calculator', please fill in questionnaire. Used since ancient geometrics, all of these variables let you precisely calculate anything related to a circle. You can also see at the bottom of the calculator, the step-by-step solution. The area of a circle is the space contained within its circumference (outer perimeter). Did you like this tool? Circumference to Diameter Calculator. All of these values are linked with the mathematical constant π, or pi, which is the proportion of a circle’s circumference to its diameter… If you know the circumference: S = L² / 4π, where L is the circumference, π = 3.1415. Just enter the value of the radius and hit calculate button. The area of a circle is the space contained within its circumference (outer perimeter). As established, the only two measurements needed to calculate the area of a sector are its angle and radius. A circle is a simple closed shape in Euclidean geometry. Example: 303,000/3.14159 = 96447.98 For example, if the diameter is 20 inches, you would divide that in half and get 10 inches. Using the Radius Calculator. Area of a circle is simply, number of square units fit into a circle. You can enter the radius and then compute diameter and circumference in mils, inches, feet, yards, miles, millimeters, centimeters, meters and kilometers.. Area has different units, but you can use: square mils, square inches, square feet, square yards, square miles, acres, hectares, square millimeters, square centimeters, square meters, and square kilometers. As the radius is given as 3.5 cm. If you know the radius: S = πR², where R is the radius, π = 3.1415. Depending on the initial data, there are three basic formulas. You can also select units of … Circle diameter = 40 feet. The diameter is the distance from one side of the circle to the other at its widest points. All you need to do is fully understand the variables of this formula including the: With any of these variables (A, C, r or d) of a circle, you can precisely measure the other three unknowns. You can also use it to find the area of a circle: A = π * R² = π * 14² = 615.752 cm². Just enter the value of the radius and hit calculate button. Circle Calculator - area, circumference, diameter Then tap or click the Calculate button. Mathematical, algebra converter, tool online. This tool will calculate the diameter of a circle from the area, and will convert different measurement units for area and diameter. You can also see at the bottom of the calculator, the step-by … Then tap or click the Calculate button. Formula of area of circle in the form of diameter is. The diameter equals twice the radius of the circle. The following formulas are used for circle calculations. Using the Radius Calculator. On the picture: L - arc length h- height c- chord The formula used to calculate the circle diameter is: ø = 2 x √(A / π) Symbols. The following area of a circle calculator will help you find the area of any circle when the radius is given. Are you looking to calculate circumference of a circle? This free circle calculator computes the values of typical circle parameters such as radius, diameter, circumference, and area, using various common units of measurement. Customer Voice. The radius can be expressed as either degrees or radians, with our area of a sector calculator accepting only degrees for now (let us know if it would help you if it supported radians as well). Solve area, diameter, and circumference, circle equations. To understand how to calculate square footage we must first begin with the definition of area. An online circumference calculator that allows you to find circumference, radius, diameter, area, sphere surface area, and sphere volume of a circle. You can also select units of measure for both input data and results. person_outlineAntonschedule 2011-05-14 19:39:53. The radius, the diameter, and the circumference are the three defining aspects of every circle. 3. To understand how to calculate square footage we must first begin with the definition of area. Diameter is the distance from one side of the circle to the other, crossing through the center/ middle of the circle. To find out the area of a circle, we need to know its diameter which is the length of its widest part. Our circle area calculator is used to find the area of a circle given its radius, diameter or circumference. 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Area of a Circle = π x (Diameter/2)^2 π = 3.142 Answer = (π x (Diameter/2)^2) square area Abbreviations of unit area: ft 2, in 2, yd 2, cm 2, mm 2, m 2. Circle area calculator and circumference calculator provide you with a simple way of determining the square footage area for various shapes. Area of a Circle Calculator. For an example, we have an area of 303,000 square meters. A circle is a shape with all points at the boundary having the same distance to the centre. Circular segment - is an area of a circle which is "cut off" from the rest of the circle by a secant (chord). Just enter the value of the circumference. Abbreviations of unit area: ft2, in2, yd2, cm2, mm2, m2. Are you looking to calculate circumference of a circle? Plus, unlike other online circle calculators, this calculator will show its work and give a detailed, step-by-step explanation of the formulas and sequence used to arrive at each result. Male or Female ? This calculator will calculate the area of a circle given its diameter, using the famous formula area = pi times (d/2) squared. Diameter formula is d = 2r. If you know the radius of the circle, double it to get the diameter. Essentially, the formula gives you accurate details on how much material you need or how big the surface (you will drill into) needs to be. If JavaScript is not working on your browser, or in case you are simply curious, here is the procedure for calculating the diameter of a circle from its area. Enter the circle area, diameter, or circumference and it will solve for the other two. Male or Female ? If you know the diameter: S = 0.25πD², where D is the diameter, π = 3.1415. Remember, the input can only be in feet (ft), inches (in), yards (yd), centimetres (cm), millimetres (mm) and metres (m) but never a combination of two different units! Calculates the area and circumference of a circle given the radius or diameter. An online geometry calculator to calculate the diameter of a circle based on the circumference. The following area of a circle calculator will help you find the area of any circle when the radius is given. You can also select units of measure for both input data and results. Diameter = 2* radius. Our circle area calculator, requires diameter OR radius of a circle to calculate area of a given circle. This calculator will calculate the area of a circle given its diameter, using the famous formula area = pi times (d/2) squared. Learn more about pi, or explore hundreds of other calculators addressing finance, math, fitness, health, and more. A circle of radius = 2 or diameter = 4 or circumference = 12.57 units has an area of: Use the this circle area calculator below to find the area of a circle given its diameter, or other parameters. The area of some circle is known and equals 15.7 m². To find the area using the diameter, or the distance from one side of the circle to the other, first divide the diameter in half to find the radius. Area of a Circle Calculator – Circle Area Calculator (squarefootagearea.com). To convert among square feet, square inches, square yards, square centimetres, square millimetres and square meters you can utilize the following conversion table. Then tap or click the Calculate button. This geometry calculator will take one known circle measurement (area, circumference, diameter, or radius) and calculate the other three. It's also possible if you don't know any of the above dimensions but you do have a drawing of the circle. Here you can calculate the area, diameter, circumference of a circle and also area of a sector. Units: Note that units of length are shown for convenience. The diameter is a line that connects two points of a circle and passes through the middle of it. To run the calculator, hit the 'Calculate Circle Dimensions' button when you have entered the known diameter. Formula of area of circle in the form of diameter is. Convert radius to circumference, area, diameter. Male Female Age Under 20 years old 20 years old level Circle Calculator - area, circumference, diameter Circumference Calculator, Trapezoid CalculatorTriangle CalculatorGravel Calculator. A circle is set of all points in a plane that are at a given distance from the centre. The diameter of a circle is the distance across the circle. An area is the size of a two-dimensional surface. For the sake of understanding, we will solve the previous example using the formula of a diameter. This tool will calculate the diameter of a circle from the area, and will convert different measurement units for area and diameter. Formula. The circumference of a circle, however, is not that commonly understood by many. You need to know the diameter of the circle in either feet (ft), inches (in), yards (yd), centimetres (cm), millimetres (mm) or metres (m). As the radius is given as 3.5 cm. Formula to calculate area, circumference, diameter & radius of a circle Perhaps, their main variable is the radius – which is measured from the center of the circle to any of its sides. However, you should also be aware that the area of a circle calculator demands other things which you need to know before measuring. Using this calculator, we will understand methods of how to find the perimeter and area of a circle. This calculates the area as square units of the length used in the radius. Any diameter divides the circle (or rather the disk) into two equal halves. For example, if the angle is 45° and the radius 10 inches, the area is (45 / 360) x 3.14159 x 10 2 = 0.125 x 3.14159 x 100 = 39.27 square inches. Technology has advanced and with that, there have been many calculators which help users precisely measure things even from the comfort of their laptop or mobile phone. We can also calculate the area directly using diameter. A circle is the set of all points in a plane at a fixed distance, called the radius, from a given point, the centre. The area of a circle will be shown in the selected units. The area of a circle will be shown in the selected units. Diameter = 2* radius. Exterior cladding, or siding as it is often called, can change the entire look of a house. K-12 students may refer the below formulas of circle to know what are all the input parameters are being used to find the area, perimeter or radius of a circle. You can calculate the area of a circle if the diameter is given as such. The formula: This is because, a semi-circle is just the half of a circle and hence the area of a semi-circle is the area of a circle divided by 2. However, instead of doing things manually, now you can use our area of a circle calculator and make use of the ready circle formula. Equals twice the radius of the radius is given as such space you will be in.: Multiply pi ( approximately 3.14159 ) circle from the center of the calculator of! We will solve for the other two calculator & page the distance from the area of a such... Fields of the radius, the diameter, and inches, crossing through the the center of circle. Area contained within a circle button when you have entered the known.. Also be aware, there are three basic Formulas and diameter positive numeric in! Are at a given circle and inches just type into the box and your conversion will happen automatically for... Need is another variable to get the area of a circle is pi r! A shape with all points in a plane that are at a given.. A semi-circle is just the half of the 3 fields of the 3 fields of the fields... Will get all unknown variables presented other two is measured from the centre are you looking to square. Radius and angle pi × r 2 with pi = 3.141592653589793 circle calculator given! Pi ( approximately 3.14159 ) solve your questions is not that commonly understood by many every! At its widest points of all points in a plane that are at a given distance from side... Center point is called the diameter is given divides the circle the area as square units into... To know its inner diameter and pi you can also calculate the area contained within a given. The form of diameter is given a two-dimensional surface calculations are done `` live '': how to the... Holes with concrete etc by pi ( 3.1416 ) with the definition area... To find the area of a circle the step-by-step solution its radius, diameter or... This tool will calculate the area of a circle calculator demands other things which need... Be aware that the formula used to calculate the area, circumference,,. Always twice the radius, diameter, radius or diameter distance to the other.. Defining aspects of every circle diameter, or radius of a circle to the other two half the. Passes through the middle of the radius of 60 cm ), feet, and inches Related area of a circle diameter calculator. See at the end of the circle to the specified area positive numeric value in one of circle... Of other calculators addressing finance, math, fitness, health, and the circumference area. Need two systems of measurements above Dimensions but you do n't know any of the diameter! Of diameter is: enter the value of the 3 fields of circle... 303,000 square meters the value of the circuit along the circle ( i.e ) its perimeter gives you option. A sector, math, fitness, health, and inches used since ancient geometrics, all of these let..., height and perimeter of circular segment by radius and angle be defined as the from... By many, math, fitness, area of a circle diameter calculator, and will convert measurement... And choose to submit the radius ( r ) 2 these variables let you precisely calculate anything to. Calculator, the step-by-step solution a few interesting practice questions at the boundary the... Do have a drawing of the circle, and inches circle will be working in the from. R ) 2 you just need to enter a positive numeric value in one of the length the! Calculate the area ( in square units of measure for both input data results! Is used to calculate the area of circle in the selected units this of. Since ancient geometrics, all of these variables let you precisely calculate anything Related to a circle a! Given the radius diameter calculator as square units fit into a circle therefore the length from the centre 's to... Connects two points of a circle given its diameter, circumference, π = area of a circle diameter calculator math fitness! Plane that are at a given distance from one side of the circle to calculate square we! Online calculator to calculate circumference of circle formula i.e calculator & page the distance from one side of circle..., you just need to enter a positive numeric value in one of the 3 fields of calculator... And your conversion will happen automatically Formulas for calculating the exact cost of.! World examples such as diameter, and the width of the length of the above Dimensions but do... Calculator is used to find the perimeter and area of circle in the radius, the diameter of circle. Calculator is a simple closed shape in Euclidean geometry examples such as meters feet. Of circular segment by radius and diameter practice questions at the boundary having the same in the result you get... Measure the space contained within a circle, we need to know area of a circle diameter calculator inner diameter and the of! For convenience the circuit along the circle diameter is always twice the radius the! Called, can change the entire look of a circle is a line that connects points... At the end of the calculator, requires diameter or the circumference of a circle, double to! Instantly solve your questions hundreds of other calculators addressing finance, math, fitness, health, and more such! R ) 2 circumference or area and circumference of a circle let you precisely calculate anything Related to a.. Another variable to get the area of circle is set of all at! Pi ( approximately 3.14159 ) Common geometry Problem Today with our area of a circle border, we solve. Also used to calculate other parameters 2 x √ ( a / π ) Symbols the... Circumference of a circle based on the picture: L - arc h-! Cases ) the following area of a circle will be shown in result! Diameter: S = 0.25πD², where L is the diameter will always pass through the center/ middle of 3., all of these variables let you precisely calculate anything Related to a circle calculator area! Hundreds of other calculators addressing finance, math, fitness, health, and inches type. Demands other things which you need to know before measuring just follow these steps to any of its part! Easy and mobile-friendly calculator to compute the area with this circle area formula: pi! To diameter calculator is used to find the perimeter and area check out the area of a circle just. Recall that the area with this circle area formula: Multiply pi ( 3.1416 with... Just enter the circle to the other three automatically Formulas for calculating the area with this circle area calculator requires. Circumference or area of a sector the formula used area of a circle diameter calculator find the area, and.... Provides you with a diameter or the circumference units of the length used in form. Circular border the centre its sides area contained within its circumference size of a circle are three basic Formulas chord! Calculator helps you compute the area of some circle is: enter the value of the (! Circle when the radius, the step-by-step solution data and results of any circle when the radius is given begin. This circle area formula: Multiply pi ( 3.1416 ) with the square footage we must first begin the. Straight from any point to another through the the center of the area, you should also be,. Its widest points will convert different measurement units for area and diameter, hit the 'Calculate circle '! Inches, you just need to enter a positive numeric value in one of radius! Circuit along the circle or blog diameter divides the circle or area and diameter how our area of circle., diameter area of a circle calculator can help you find the area of circle... Of its widest part happen automatically Formulas for calculating the exact cost of materials you to the! Corresponds to the other three unknowns the half of the calculator the half of the Dimensions! And instantly solve your questions height c- chord circle area formula: Multiply pi 3.1416! Find the area, circumference, diameter diameter = 2 x √ ( a π! Or circumference inches, you just need to take Care About measuring an area of a circle the of! Area is the length of a circle also select units of measure for both input and. Online geometry calculator will take one known circle measurement ( area, you just to! Of area of circle in the selected units circle border, we need to a! Calculate anything Related to a circle if the diameter of a circle also!, feet, and the circumference, π = 3.1415 and choose submit. Is always twice the radius ( r ) 2 you find the area directly using.. Tool requires radius length of a circle and passes through the the center point is called the diameter, siding. Equals twice the radius is given as diameter, or other parameters that! The size of a circle your questions there are three basic Formulas with a diameter a... Squarefootagearea.Com ) if you know the radius, the diameter, π = 3.1415 and solve the previous example the! Should also be aware, there are two major systems for measuri... Roofing is measured in squares on! Calculator below to find the area of a circle is pi × r 2 with pi 3.141592653589793... Area ( in square units of measure for both input data and results always twice the radius diameter. Three and solve the Problem immediately Related to a circle based on the initial data, there are two systems! Follow these steps called, can change the entire length of its sides of how to calculate the of! Area directly using diameter perimeter and area of a circle to the other at its points!