First find the radius = 12/(2*pi) = 1.909859317 inches
Area = pi*1.9098593172 = 11.4591559 or about 11.5 square inches
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The area of a circle with an 8 inch diameter is approximately 50.27 square inches.
19.63 square inches are in the area of a 5-inch diameter circle.
The area of a 3-inch diameter circle is about 7.068 square inches.
Area of circle is pi*radius*radius. hence area of 1.5 inch circle is 7.065 square inches.
There are 100*pi square inches in a 20 inch diameter circle