Elementary Geometry for College Students (5th Edition)

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

Chapter 1 - Section 1.7 - The Formal Proof of a Theorem - Exercises - Page 53: 23

Answer

x=180$^{\circ}$ m$\angle$2=80$^{\circ}$

Work Step by Step

Adjacent angles with outer edges that form a straight line are supplementary m$\angle$2+m$\angle$3=180$^{\circ}$ $\frac{x}{2}$-10+$\frac{x}{3}$+40=180$^{\circ}$ $\frac{x}{2}$+$\frac{x}{3}$=150$^{\circ}$ 5x=900$^{\circ}$ x=180$^{\circ}$ m$\angle$2=$\frac{x}{2}$-10=$\frac{180}{2}$-10=80$^{\circ}$
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