Question #N176
A circle has a radius of 5 centimeters. What is the circumference of the circle, in centimeters? (Express your answer in terms of $\pi$.)
A. $\pi$
B. $5 \pi$
C. $10 \pi$
D. $25 \pi$
Correct Answer is: C
The circumference of a circle is given by the formula $C = 2 \pi r$, where $r$ is the radius. Substituting 5 for $r$, we get $C = 2 \pi (5)$, or $C = 10 \pi$.