The area of a circle with a diameter of 20 cm is: 314.2 cm2
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A circle with a radius of 10 cm has an area of 314.16 square cm
Area of the circle: pi*20*20 = 400*pi square cm
The area of a circle with a diameter of two cm is about 3.1416 cm.
The formula to calculate the area of a circle is A = πr^2, where r is the radius of the circle. Since the diameter is 20 cm, the radius would be half of that, which is 10 cm. Plugging in the radius into the formula, we get A = π(10)^2 = 100π cm^2. Therefore, the area of the circle with a diameter of 20 cm is 100π square centimeters.
The diameter of a circle with an area of 86.54625 cm2 is: 10.49734 cm