SAT Math Multiple Choice Question 970: Answer and Explanation

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Test Information

Question: 970

If the area of a circle is 64π, what is the circumference of the circle?
  • A. 8π
  • B. 16π
  • C. 32π
  • D. 64π

Correct Answer: B



Difficulty: Easy

Category: Additional Topics in Math / Geometry

Strategic Advice: The key to answering circle questions is often in finding the length of the radius. Make that the first thing you look for.

Getting to the Answer: The area of a circle is given by A = πr2. Substitute the given area (64π) into the formula to get 64π = πr2, which simplifies to r = 8. The circumference of a circle is equal to 2πr, so the circumference of this particular circle is 2π × 8 = 16π. Therefore, (B) is correct.

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