Elementary Technical Mathematics

Published by Brooks Cole
ISBN 10: 1285199197
ISBN 13: 978-1-28519-919-1

Chapter 12 - Section 12.1 - Angles and Polygons - Exercise - Page 388: 24



Work Step by Step

We know that $\angle 1$ and $\angle4$ are supplementary, so $$\angle 1+\angle 4=180 \Longrightarrow 8x+60+3x+10=180 \Longrightarrow 11x=110$$ and hence $x=10^o$.
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