Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 3 - Section 3.3 - Isosceles Triangles - Exercises - Page 160: 29


m$\angle$A=52$^{\circ}$ m$\angle$B=64$^{\circ}$ m$\angle$C=64$^{\circ}$

Work Step by Step

m$\angle$B=m$\angle$C=m$\angle$A+12 m$\angle$A+m$\angle$B+m$\angle$C=180 m$\angle$A=m$\angle$A+12+m$\angle$A+12=180 3m$\angle$A=156 m$\angle$A=52^{\circ}$ m$\angle$B=m$\angle$C=52+12=64$^{\circ}$
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