Question #N607
A circle has a radius of 5 units. What is the circumference of the circle, in units? (Express your answer in terms of \pi.)
A. 5\pi
B. 10\pi
C. 25\pi
D. 50\pi
Correct Answer is: B
The circumference of a circle is given by the formula $C = 2\pi r$, where r is the radius of the circle. Substituting 5 for r, we get C = 2\pi (5) = 10\pi.