Geometry: Common Core (15th Edition)

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

Chapter 2 - Reasoning and Proof - 2-6 Proving Angles Congruent - Got It? - Page 121: 1

Answer

x=40

Work Step by Step

Use the Vertical Angles Theorem to write an equation. $3x=2x+40\longrightarrow$ Subtraction property of equality (subtract 2x) $x=40$
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