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The answer will depend on what is 20 inches: the radius or diameter or something else.

Q: What is the circumference of 20 inches?

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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

Related questions

The circumference of a circle if its diameter is 20 inches is: 62.83 inches (diameter x Pi = circumference).

The circumference of the sphere is ~62.831 inches.

The circumference of a circle with a diameter of 20 inches is: 62.83 inches. (C = d x Pi)

If the diameter of a circle is 20 inches, the circumference is about 62.83 inches. (C = d x Pi).

If the circumference of a circle is 62.8 inches the diameter is: 20 inches.

20 inches

20/Pi = 6.37 inches

125.664 inches (rounded)

62.8 inches.

r = 3.18 inches.

20=2pir. 20/2pi is 3.1831in. So diameter is about 6.3662 inches (rounded)

radius = 20/(2*pi) = 3.183098862 inches