4. In triangle ABC, BO and CO are the internal bisectors of angle B and angle C. Prove that angle BOC = 90° + }ZA.

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter4: Quadrilaterals
Section4.4: The Trapezoid
Problem 3E: What type of trapezoid a has congruent diagonals. b has congruent base angles.
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4. In triangle ABC, BO and CO are the internal bisectors of angle B and angle C. Prove that
angle BOC = 90° + ZA.
Transcribed Image Text:4. In triangle ABC, BO and CO are the internal bisectors of angle B and angle C. Prove that angle BOC = 90° + ZA.
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