SAT Math Multiple Choice Practice Question 335: Answer and Explanation

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Question: 335

5. The radius of circle A is twice the radius of circle B. If the sum of their circumferences is 36π, then what is the radius of circle A?

A. 9
B. 12
C. 14
D. 16
E. 18

Correct Answer: B

Explanation:

B Let the radius of circle and the radius of circle . It is given that . The circumference of a circle can be found with the equation . The sum of their circumferences is 36π:

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