Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Chapter 3 - Section 3.3 - Isosceles Triangles - Exercises: 21


$\angle$1=44$^{\circ}$ $\angle$2=68$^{\circ}$

Work Step by Step

Given: isosceles triangle where $\angle$3=68$^{\circ}$ so $\angle$2=$\angle$3=68$^{\circ}$ $\angle$1+$\angle$2+$\angle$3=180$^{\circ}$ $\angle$1+68$^{\circ}$+68$^{\circ}$=180$^{\circ}$ $\angle$1=180$^{\circ}$-136$^{\circ}$ $\angle$1=44$^{\circ}$
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