Diameter = 2 x radius = 5 inches.
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12.5 inches
The answer is 50 inches.
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
Radius of circle: 25/2 = 12.5 feet
The diameter of a circle with a circumference of 25 inches is: 78.54 inches. (d = c divided by Pi).