6
Answer: DSet 2: Circles (Intermediate)
Explanation
PROBLEM
A circle has circumference 4pi. What is its radius?
A circle has circumference 4pi. What is its radius?
A.
3
B.
4
C.
1
D.✓ Correct
2
Detailed Explanation
Choice D is the best answer. C = 2 times pi times r. 4pi = 2 times pi times r. r = 2
Why others are wrong:
A: 3 is incorrect because it does not satisfy the equation.
B: 4 is incorrect because it does not satisfy the equation.
C: 1 is incorrect because it does not satisfy the equation.