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 ?

C. 5
D. 5π
E. 10π

Correct Answer: A


A The formula for the circumference of a circle is C = 2πr or C = dπ. (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 = πd. Now, just solve for d, which equals .

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