equal angles after reflecting an external bisector on 2 internal bisectors
Source: IMAR 2012 p3
September 26, 2018
equal anglesgeometryreflectionangle bisector
Problem Statement
Given a triangle , let be a point different from on the external bisectrix of the angle , and let be an interior point of the segment . Reflect in the internal bisectrices of the angles and to obtain two lines that meet at some point . Show that the angles and are congruent.