Elementary Geometry for College Students (5th Edition)

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

Chapter 2 - Section 2.1 - The Parallel Postulate and Special Angles - Exercises: 2a


m $\angle$ 5 = 109$^{\circ}$

Work Step by Step

m$\angle$3 = 71$^{\circ}$ By the Interior Angles Postulate: m$\angle$3 + m$\angle$5 = 180∘ Substitute the value of 71 into the equation. 71 + m$\angle$5 = 180 Subtract 71 from 180 Simplify. m$\angle$5 = 109$^{\circ}$
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