Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10: 9781285195698
ISBN 13: 978-1-28519-569-8

Chapter 2 - Section 2.4 - The Angles of a Triangle - Exercises - Page 93: 18



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}$
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