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Sagot :
The formula for the circumference of a circle given it's radius is :
C = 2πr
Reversely, the formula for the radius given it's circumference is :
r = C/2π
From the given problem, the circumference is 63 inches,
Solve for the radius using π = 3.14
r = 63/(2 x 3.14)
r = 10.03 inches
So the answer is Choice C. 10 inches
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