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Purple Comet 2018 MS problem 12

Source:

March 19, 2020
geometry

Problem Statement

Line segment AB\overline{AB} has perpendicular bisector CD\overline{CD}, where CC is the midpoint of AB\overline{AB}. The segments have lengths AB=72AB = 72 and CD=60CD = 60. Let RR be the set of points PP that are midpoints of line segments XY\overline{XY} , where XX lies on AB\overline{AB} and YY lies on CD\overline{CD}. Find the area of the region RR.