The formula for the area of a circle is A = pr2, p=3.142, r=1/2d= 12.5in, therefore
A = 3.142 x (12.5in)2
A = 490.9375in2
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The area is 78.5 square inches.
490.9 square inches for a 25-inch diameter circle.
The area of a sector of a circle that has a diameter of ten inches if the length of the arc is ten inches is: 25 square units.
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
The diameter of a circle with a circumference of 25 inches is: 78.54 inches. (d = c divided by Pi).