7
Answer: CSet 1: Circles (Intermediate)
Explanation
PROBLEM
A circle has circumference 16pi. What is its radius?
A circle has circumference 16pi. What is its radius?
A.
4
B.
16
C.✓ Correct
8
D.
6
Detailed Explanation
Choice C is the best answer. C = 2 times pi times r. 16pi = 2 times pi times r. r = 8
Why others are wrong:
A: 4 is incorrect because it does not satisfy the equation.
B: 16 is incorrect because it does not satisfy the equation.
D: 6 is incorrect because it does not satisfy the equation.