The area of a circle if the radius is 2.5 inches is: 19.63 square inches.
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Area = Pi(r)2 - A circle with a radius of 25 inches has an area of 1,963.5 square inches.
Area = pi R2 = 25 pi = 78.54 square inches(rounded)
A circle with a circumference of 25 inches has a radius of about 3.979 inches.
pi*25 = 78.5.
Radius = 1/2 (diameter) = 25 inches.