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: 30


m$\angle$A=40$^{\circ}$ m$\angle$B=70$^{\circ}$ m$\angle$C=70$^{\circ}$

Work Step by Step

m$\angle$C=m$\angle$B m$\angle$A=.5m$\angle$B+5 m$\angle$A+m$\angle$B+m$\angle$C=180 .5m$\angle$B+5+m$\angle$B+m$\angle$B=180 2.5m$\angle$B=175 m$\angle$B=70 m$\angle$C=m$\angle$B=70 m$\angle$A=.5m$\angle$B+5 m$\angle$A=40
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