3.14 x 12.52 = 490.625 or round it up to 490.63 millimeters.
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A circle with a diameter of 25 mm has an area of 490.9 square mm.
490.9 square inches for a 25-inch diameter circle.
Calculate the radius, which is simply 1/2 the diameter. Then use the standard formula for the area of a circle. ________________________________________________________________ The circle area = (pi) x diameter / 4 = 3.14 x 25/4 = 19.625 Sq inch
A circle with a radius of 12.5 feet (25/2) has an area of 490.87 square feet.
The area is 78.5 square inches.