A circle with a diameter of 25 mm has an area of 490.9 square mm.
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3.14 x 12.52 = 490.625 or round it up to 490.63 millimeters.
A circle with a radius of 25 cm has an area of 1,963.5 square cm.
Find the area of the circle and divide by 4.
A circle with a radius of 12.5 feet (25/2) has an area of 490.87 square feet.
490.9 square inches for a 25-inch diameter circle.