# SAT Math Multiple Choice Question 970: Answer and Explanation

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**Question: 970**

- A. 8π
- B. 16π
- C. 32π
- D. 64π

**Correct Answer:** B

**Explanation:**

**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* = π*r*^{2}. Substitute the given area (64π) into the formula to get 64π = π*r*^{2}, which simplifies to *r* = 8. The circumference of a circle is equal to 2π*r*, so the circumference of this particular circle is 2π × 8 = 16π. Therefore, (B) is correct.