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Knowing that the formula to find the area of a circle is

* Ac = πr2 We must first find the radius of the circle with this formula:

* Rc = d/2 So dividing the diameter by two we get a radius of 20 feet.

* 20' = 40'/2 Now that the radius is found, we can plug it in and fine the exact answer needed:

* Ac = π(20ft)2 * Ac = π(400ft2) We find that the exact answer is 400πft2.

However if you want to calculate out the the value by multiplying out π the answer would change from 400πft2 to approximately 1256ft2. π = pi

π ≈ 3.14

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Q: What is the area of a circle if the diameter is 40 feet?
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