The answer will depend on what is 20 inches: the radius or diameter or something else.
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If the diameter of a circle is 20 inches, the circumference is about 62.83 inches. (C = d x Pi).
20 inches
62.8 inches.
Circumference = (pi) x (diameter) Diameter = Circumference/pi 62.8/pi = 19.98986 (rounded) which is awfully close to 20.
5*4 = 20 square inches