28.27
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A circle with a radius of 3 inches has an area of 28.27 square inches.
2.999239468 or about 3 inches
If you mean a circle then:- radius = sq rt of (72/pi) = 4.787 inches to 3 decimal places
Area = pi*102 = 314.159 square inches to 3 dp
Area = pi*r2 Area = pi(3 in)2 Area = 28.3 inches2 ===============