Answer
m$\angle$A=108$$^{\circ}
Work Step by Step
By the same proof as the previous problem, angles 1 and 3 are congruent.
m$\angle$1=m$\angle$3=36$^{\circ}$
m$\angle$A+m$\angle$1+m$\angle$3=180
m$\angle$A+36+36=180
m$\angle$A=108$^{\circ}$
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 2 - Section 2.4 - The Angles of a Triangle - Exercises - Page 97: 18
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