Introductory Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-805-X
ISBN 13: 978-0-13417-805-9

Chapter 2 - Section 2.6 - Problem Solving in Geometry - Exercise Set - Page 178: 34


18$^\circ$, 72$^\circ$, and 90$^\circ$

Work Step by Step

The sum of the measures of the angles of a triangle is always 180$^\circ$. x+4x+5x=180 5x+5x=180 10x=180 x=$\frac{180}{10}$ x=18$^\circ$ 4x=4(18)=72$^\circ$ 5x=5(18)=90$^\circ$
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