Question #N437
A circle with radius 5 has a circumference of 10\pi. If the radius of the circle is doubled, what is the new circumference?
A. 10\pi
B. 20\pi
C. 50\pi
D. 100\pi
Correct Answer is: B
The circumference of a circle is given by the formula C = 2\pi r, where C is the circumference and r is the radius. Doubling the radius doubles the circumference. Since the original circumference is 10\pi, the new circumference is 2(10\pi) = 20\pi.