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There are 100*pi square inches in a 20 inch diameter circle
The radius of a circle is half the diameter, so the radius of a 6 inch diameter circle is 3 in.
15 x 3.1416, call it 47 and an eighth inches.
The area of a 3-inch diameter circle is about 7.068 square inches.
A circle with an 8-inch diameter has a perimeter of 25.1 inches.