I assume 12 is diameter. If so 12/2 is radius of 6in. 6x6xpi is 113.1squared inches
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Area of a 12-inch circle: 113.1 square inches.Area of a 16-inch circle: 201.1 square inches.
The approximate area of a circle with a 12-inch diameter is: 113 square inches.
Area of a circle = (1/2 x diameter)2 x piArea of a 24 inch diameter circle:(12 inches)2 x 3.1416 = 144 square inches x 3.1416 = 452.4 square inches
A 72-inch diameter circle has an area of: 28.3 square feet.
A 32-inch circle has an area of 804 square inches.