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1. www.mathsisfun.com › geometry › circle-areaArea of a Circle - Math is Fun

   www.mathsisfun.com › geometry › circle-area

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   How to Calculate the Area. The area of a circle is: π ( Pi) times the Radius squared: A = π r2. or, when you know the Diameter: A = (π/4) × D2. or, when you know the Circumference: A = C2 / 4π. Example: What is the area of a circle with radius of 3 m ? Radius = r = 3. Area = π r2. = π × 32. = 3.14159... × (3 × 3) = 28.27 m2 (to 2 decimal places)

   • Circle Area by Sectors

     Math explained in easy language, plus puzzles, games,...

   • Circle Area by Lines

     Things to Try. Try a low value for "sides": you can see that...

   • Cross Section

     Cross Sections. A cross section is the shape we get when...

   • PI

     Draw a circle with a diameter (all the way across the...

   • Area of Plane Shapes

     Area is the size of a surface Learn more about Area, or try...

2. www.omnicalculator.com › math › area-of-a-circleArea of a Circle Calculator

   www.omnicalculator.com › math › area-of-a-circle

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   4 dni temu · The formula to calculate the area of a circle using radius is as follows: Area of a circle = π × r2. And, to calculate the area of a circle using diameter use the following equation: Area of a circle = π × (d/2)2. where: π is approximately equal to 3.14.

3. www.mathsisfun.com › geometry › circleCircle - Math is Fun

   www.mathsisfun.com › geometry › circle

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   Example: You walk around a circle which has a diameter of 100m, how far have you walked? Distance walked = Circumference = π × 100m = 314m (to the nearest m)

4. sciencing.com › calculate-area-circle-diameter-7391669How to Calculate the Area of a Circle With the Diameter

   sciencing.com › calculate-area-circle-diameter-7391669

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   13 lut 2023 · The formula for calculating the area of a circle is A = π‌ r ‌ 2 where pi (π) equals 3.14 and the radius (‌ r ‌) is half the diameter ‌ r ‌ = ‌ d ‌/2. Determine the diameter of the circle. The first step for calculating the area of a circle from its diameter is to find that diameter.

5. www.gigacalculator.com › calculators › area-of-circle-calculatorArea of a Circle Calculator

   www.gigacalculator.com › calculators › area-of-circle-calculator

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   Task 1: Given the radius of a circle, find its area. For example, if the radius is 5 inches, then using the first area formula calculate π x 5 2 = 3.14159 x 25 = 78.54 sq in. Task 2: Find the area of a circle given its diameter is 12 cm. Apply the second equation to get π x (12 / 2) 2 = 3.14159 x 36 = 113.1 cm 2 (square centimeters).

6. www.sensorsone.com › circle-diameter-to-area-calculatorDiameter to Area of Circle Calculator - SensorsONE

   www.sensorsone.com › circle-diameter-to-area-calculator

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   This tool will calculate the area of a circle from the diameter, and will convert different measurement units for diameter and area. Formula. The formula used to calculate circle area is: A = π · (ø/2) 2. A = ¼ · π · (ø/2) 2. Symbols. A = Circle area; π = Pi = 3.14159… ø = Circle diameter; Diameter of Circle. Enter the diameter of a ...

7. www.inchcalculator.com › circle-area-calculatorArea of a Circle Calculator - Inch Calculator

   www.inchcalculator.com › circle-area-calculator

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   Calculate the area of a circle given the radius, diameter, or circumference. Plus learn the formulas and steps to find a circle's area.