A circle with a diameter of 7 inches has an area of 38.48 square inches.
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A circle with a 7 inch diameter has an area of 38.48451.
A 36-inch diameter circle has an area of: 1,017.9 square inches.* * * * *which is 7.07 square feet.
area = pi*r*r r = diameter/2 r=7 7*7 = 49 49pi, or 153.9380400258998686846695257807 sq in
A 7-meter diameter circle has an area of 38.5 square meters.
We assume the 7 inches is the diameter (D). Area = Pi/4 * D2 Area = 0.7854 * 7 * 7 = 38.4845 sq.inches (rounded to 4th decimal).