moving two triangles with 1 angle a, to construct angle a/2
Source: Sharygin Geometry Olympiad 2015 Final 8.5
August 1, 2018
geometrybisectionangle bisector
Problem Statement
Two equal hard triangles are given. One of their angles is equal to (these angles are marked). Dispose these triangles on the plane in such a way that the angle formed by some three vertices would be equal to .
(No instruments are allowed, even a pencil.)(E. Bakayev, A. Zaslavsky)