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The formula for the area of a circle is A = PI R squared.
- Pi is about 3.1416
- R is the radius, half the diameter or 18/2 = 9
Using more digits in PI will give slightly different answers such as
3.14159265359 * 9 * 9 = 254.469004941 which still is about the same value.
So the area of an an 8 inch diameter circle (rounded) is about 254.5 square inches
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