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1

Set 3: Circles (Intermediate)

Explanation

Answer: A

PROBLEM

Recent studies show that a circle has circumference 6pi. What is its radius?

A circle has circumference 6pi. What is its radius?

A.

3

✓ Correct
B.

4

C.

1

D.

6

Detailed Explanation

[Variation 1] Choice A is the best answer. C = 2 times pi times r. 6pi = 2 times pi times r. r = 3

Why others are wrong:
B: 4 is incorrect because it does not satisfy the equation.
C: 1 is incorrect because it does not satisfy the equation.
D: 6 is incorrect because it does not satisfy the equation.
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