2012 OIM Problems/Problem 1
Problem
Equilateral triangles 
and 
are drawn on a rectangle 
so that each one shares points with the interior of the rectangle. Line 
cuts line 
at 
. Line 
cuts line 
at 
. Prove that the triangle 
is equilateral.
~translated into English by Tomas Diaz. ~orders@tomasdiaz.com
Solution
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