Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 7 - Similarity - Get Ready! - Page 429: 3


70$^{\circ}$ Adjacent angles forming a straight angle are supplementary

Work Step by Step

Looking at the diagram, you see that $\angle$3 and the 110$^{\circ}$ angle form a straight line. These angles are supplementary angles, meaning they add up to 180 degrees. So 180$^{\circ}$-110$^{\circ}$=70$^{\circ}$
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