6.75 inches, of course!
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The circumference of a circle with a 20.5 inch diameter is 64.4 inches.
The area of a circle that has an 8.5 inch diameter is: 56.75 square inches.
A 72-inch diameter circle has an area of: 28.3 square feet.
The approximate area of a circle with a 12-inch diameter is: 113 square inches.
A 4-inch diameter circle has an area of 12.566 square inches.