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A circle with a radius of 18 inches has an area of 1,017.88 square inches.
A circle with a radius of 18 centimeters has an area of 1017.88 square centimeters.
A circle with a radius of 9 cm has an area of 254.47 square cm
Divide the area by Pi. Take the square root of the result. This is the radius. Now double the radius to get the diameter. -> Answer = 18
The area is 1,020 square inches.