Hi All,

There's a great "pattern" behind this question.

Since we're dealing with 2 semi-circles, and QR represents the SAME radius in both of them, we know that the 2 semi-circles are IDENTICAL. Thus, the perimeter of the shape is made up of….

The circumference of one full circle + the diameter of that circle.

Since the radius = 5, we know….

Circumference = 2r(pi) = 10pi

Diameter = 2r = 10

Total perimeter = 10pi + 10

Final Answer:

GMAT assassins aren't born, they're made,

Rich

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