Art of Problem Solving

1996 USAMO Problems/Problem 5: Difference between revisions

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Revision as of 12:33, 4 July 2013

Problem:


Let $ABC$ be a triangle, and $M$ an interior point such that $\angle MAB=10^\circ$, $\angle MBA=10^\circ$ , $\angle MAC= 40^\circ$ and $\angle MCA=30^\circ$. Prove that the triangle is isosceles.



Solution:


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