Calculate the radius, which is simply 1/2 the diameter. Then use the standard formula for the area of a circle.
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The circle area = (pi) x diameter / 4 = 3.14 x 25/4 = 19.625 Sq inch
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490.9 square inches for a 25-inch diameter circle.
A circle with a diameter of 25 mm has an area of 490.9 square mm.
Area = pi R2 = 25 pi = 78.54 square inches (rounded)
I'm not completely sure what a "2.5 inch circle" is. Is that the distance all the way across the circle (diameter), or is it the distance from the center of the circle to its curve (radius) ? If diameter = 2.5 inches, then area = 4.909 square inches If radius = 2.5 inches, then area = 19.635 square inches
A circle with a radius of 12.5 feet (25/2) has an area of 490.87 square feet.