8
Answer: DSet 2: Circles (Intermediate)
Explanation
PROBLEM
A circle has circumference 8pi. What is its radius?
A circle has circumference 8pi. What is its radius?
A.
2
B.
2
C.
8
D.✓ Correct
4
Detailed Explanation
Choice D is the best answer. C = 2 times pi times r. 8pi = 2 times pi times r. r = 4
Why others are wrong:
A: 2 is incorrect because it does not satisfy the equation.
B: 2 is incorrect because it does not satisfy the equation.
C: 8 is incorrect because it does not satisfy the equation.