Answer
$x=30$
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
$30=x$
Geometry: Common Core (15th Edition)
by Charles, Randall I.
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
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