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C = circumference, d = diameter, r = radius

C = Pi * d

25 in. = 3.1415 * d

d = 25 in./3.1415

d = 7.9577 in.

r = d/2

r = 7.9577 in./2

r = 3.979 in.

Therefore, a circle with a circumference of 25 inches has a radius of about 4 inches.

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Q: What is the radius of a circle with a 25 inch circumference?
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