Question #N400
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 $r$ gives $C = 2\pi (5) = 10\pi$.