GMAT Practice Question Set #37 (Question 109-111)

Problem Solving Question #111: Circular Ring With Thickness  
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The figure here is a ring with a thickness shown in black. If the radius to the outside edge of the ring  is r and the thickness of the ring is t, then which of the following expressions best describes the area of the ring's thickness?




`pi(r^2 - t^2)`







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