A circle has a circumference of 36π cm. What is the radius of the circle?
Correct: A
The formula for the circumference of a circle is C = 2πr, where C is the circumference and r is the radius. Given C = 36π, we can set up the equation 36π = 2πr. Dividing both sides by 2π gives us r = 36π / 2π = 18 cm.