The area of a circle is given by the formula A = πr2 where pi is the ratio of the circumference of a circle to its diameter and r is the radius. π = 3.1416 approx.
A = π182 = 324π = 1017.88 in2 (2dp)
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A circle with a radius of 18 inches has an area of 1,017.88 square inches.
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