radius = 18/(2*pi) 2.864788976
area = pi*2.8647889762 = 25.783 square inches to 3 dp
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The area of a circle that has a circumference of 18 is 25.78 inches squared.
A circle with a radius of 18 inches has a circumference of 113.097 inches.
The circumference of a circle with a diameter of 18 inches is 56.5 inches.
Circumference = 2*pi*18 = 113.097 inches to 3 decimal places
Radius of circle: 18/2pi = 2.865 inches rounded to 3 decimal places