Source: GMAT Prep
The surface of a mirror is composed of a rectangular piece that is 9 feet long and two semicircular pieces whose diameters are equal to the width of the rectangular piece, as shown in the figure. If the ratio of the area of the rectangular piece to the total area of the two semicircular pieces is 9/pi, what is the width of the rectangular piece, in feet?
A. 1
B. 2
C. 3
D. 4
E. 5
The OA is D
The surface of a mirror is composed of a rectangular piece that is 9 feet long and two semicurcilar pieces whose
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