Geometry: Common Core (15th Edition)

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

Chapter 3 - Parallel and Perpendicular Lines - Chapter Test - Page 211: 3



Work Step by Step

We know that the sum of the angles of a triangle are 180 degrees. We will call the unknown angle y. This gives: $x+20+y=180\\ x+y=160\\ y=160-x$
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