equal angles wanted inside a parallelogram, parallel, angle bisectors
Source: 2005 Oral Moscow Geometry Olympiad grades 8-9 p2
October 16, 2020
geometryparallelogramequal anglesangle bisector
Problem Statement
A parallelogram of is given. Line parallel to intersects the bisectors of angles and at points and , respectively. Prove that the angles and are equal. (A. Hakobyan)