RMO 2003 Problem 1 - Rotation in Math Olympiad Geometry

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Learn how to use rotation in Math Olympiad Geometry using this problem from Regional Math Olympiad 2003, Problem 1.

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It is more simple... rotate MB around M and NC around N, in order to form a right triangle. Connect A wit hthe point P where there is the right angle. Then it is obvious that the requested angle is half of 90°..

enzozappala
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This is where trig comes handy as well

yashvardhan