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PhyCS
A diameter of 18 inches means that its radius is 9 inches, and the formula for the area of a circle is equal to pi times r^2. r^2 = 81, so the area is 81 * pi = approximately 254.46900494 square inches
Billymkhoi
We already know that area of a circle is calculated by the equation: S= r^(2)* π.

The diameter is 18 in, so the radius is:
18 / 2= 9 in

Area of the circle is:
S= 9^(2)* π= 2.545*10^(2) in^(2)

Hope this would help~

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