None. 2.5 inches is a measure of distance, it is a linear measure and has absolutely no area associated with it.
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The area is 78.5 square inches.
5 inches.
You do length times width (A=lw) for the area of a square. So it would be 25 Work; 5 * 5 = 25 square inches
The area of the full circle is (pi R2) = (25 pi) square inches. The full circumference is (2 pi R) = (10 pi) inches. An arc length of 10 is [ 10/(10 pi) ] = ( 1 / pi ) of the full circle. So the area of the sector is (full area / pi) = (25 pi) / pi = 25 square inches
490.9 square inches for a 25-inch diameter circle.