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 - Practice and Problem-Solving Exercises - Page 124: 8



Work Step by Step

Use the Vertical Angles Theorem to write an equation and solve for x. $x+90=4x\longrightarrow$ Subtraction property of equality; Subtract x $90=3x\longrightarrow$ Division property of equality; Divide by 3 $30=x$
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