Bunuel wrote:

If the circumference of a circle inscribed in a square is 25π, what is the perimeter of the square?

A. 20

B. 25

C. 40

D. 50

E. 100

When a circle is inscribed in a square, the diameter of the circle is equal to the side of the square.

Since circumference = πd, we have:

πd = 25π

d = 25 = side of the square

Thus, the perimeter of the square is 25 x 4 = 100.

Answer: E

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Jeffery Miller

Head of GMAT Instruction

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