Set 5: Circles (Intermediate)

[Variation 2] **Choice B is the best answer.** C = 2 times pi times r. 16pi = 2 times pi times r. r = 8

Explanation

Answer: B

PROBLEM

Intriguingly, a circle has circumference 16pi. What is its radius?

A circle has circumference 16pi. What is its radius?

✓ Correct

Detailed Explanation

[Variation 2] Choice B is the best answer. C = 2 times pi times r. 16pi = 2 times pi times r. r = 8

Why others are wrong:

A: 6 is incorrect because it does not satisfy the equation.

C: 10 is incorrect because it does not satisfy the equation.

D: 16 is incorrect because it does not satisfy the equation.