Area = pi*42 = 50.265 square inches to 3 decimal places
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The area of a 3-inch diameter circle is about 7.068 square inches.
19.63 square inches are in the area of a 5-inch diameter circle.
The area of a circle with an 8 inch diameter is approximately 50.27 square inches.
9.082
There are 100*pi square inches in a 20 inch diameter circle