Help with an analytical proof of: The bisector of an exterior angle determined by the two equal sides of an isosceles triangle is parallel to the  third side

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
Problem 1CT
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Help with an analytical proof of: The bisector of an exterior angle determined by the two equal sides of an isosceles triangle is parallel to the 
third side

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