#### Answer

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$^\circ$

Published by
Pearson

ISBN 10:
0-13417-805-X

ISBN 13:
978-0-13417-805-9

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

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