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 Review - Page 209: 28



Work Step by Step

Using the fact that triangles add to 180 degrees, we find: $x+10+x-20+x+25=180\\ 3x+15=180\\ 3x=165\\ x=55$
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