10
Answer: BSet 1: Circles (Intermediate)
Explanation
PROBLEM
A circle has circumference 6pi. What is its radius?
A circle has circumference 6pi. What is its radius?
A.
1
B.✓ Correct
3
C.
6
D.
2
Detailed Explanation
Choice B is the best answer. C = 2 times pi times r. 6pi = 2 times pi times r. r = 3
Why others are wrong:
A: 1 is incorrect because it does not satisfy the equation.
C: 6 is incorrect because it does not satisfy the equation.
D: 2 is incorrect because it does not satisfy the equation.
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