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GRE Quantitative Reasoning QUESTION #8099
Question 1

The circumference of circle $C$ is $18\pi$.

Compare:

Column A: The diameter of circle $C$

Column B: $9$

  • Column A is greater✔️
  • Column B is greater
  • The two quantities are equal
  • The relationship cannot be determined from the information given
Correct Answer Explanation

The circumference formula is $C = \pi d$, where $d$ is the diameter.

$18\pi = \pi d \Rightarrow d = 18$

Column A = 18, Column B = 9.

Since $18 > 9$, Column A is greater.