A circle with a radius of 18 inches has an area of 1,017.88 square inches.
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The area is 1,020 square inches.
The radius is 9 inches because area of circle is pi*9 squared = 81pi square inches and the diameter is twice the radius which is 2*9 = 18 inches
Radius of circle: 18/2pi = 2.865 inches rounded to 3 decimal places
radius = 18/(2*pi) 2.864788976 area = pi*2.8647889762 = 25.783 square inches to 3 dp
A circle with a radius of 18 inches has a circumference of 113.097 inches.