The formula for the area of a circle is A = PI R squared.
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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A 1.25-inch diameter circle contains 1.227 square inches.
A 4.75-inch diameter circle contains 17.72 square inches.
Area of circle in square inches = pi*radius squared
Area of a circle = pi*radius2 inches
A 20-inch diameter circle contains: 314.16 square inches.