A = pi * r2so:
A = 3.14 * 82 = 200.96 square meters
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The diameter of a circle whose area is 200.96 is: 16
As the area of a circle A equals pi times the radius squared, and doubling the diameter means multiplying the radius by four, the area is multiplied by 16 when you double the diameter.
Diameters cannot be found from that linear measurement. A diameter is the length across the center of the circle. It can also be found by doubling the radius of a circle.
Area of a 12-inch circle: 113.1 square inches.Area of a 16-inch circle: 201.1 square inches.
201.06 square centimeters.