Set 5: Circles (Intermediate)

[Variation 2] **Choice C is the best answer.** C = 2 times pi times r. 12pi = 2 times pi times r. r = 6

Explanation

Answer: C

PROBLEM

Intriguingly, a circle has circumference 12pi. What is its radius?

A circle has circumference 12pi. What is its radius?

✓ Correct

Detailed Explanation

[Variation 2] Choice C is the best answer. C = 2 times pi times r. 12pi = 2 times pi times r. r = 6

Why others are wrong:

A: 5 is incorrect because it does not satisfy the equation.

B: 4 is incorrect because it does not satisfy the equation.

D: 8 is incorrect because it does not satisfy the equation.