# SAT Math Multiple Choice Practice Question 403: Answer and Explanation

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**Question: 403**

**7.** What is the diameter of a circle with a circumference of 5 ?

A.

B.

C. 5

D. 5π

E. 10π

**Correct Answer:** A

**Explanation:**

**A** The formula for the circumference of a circle is *C* = 2π*r* or *C* = *d*π. (If you forget the formula, you can look it up at the beginning of the section.) The circumference of the circle is 5, so 5 = π*d.* Now, just solve for *d*, which equals .