Answer
$=3.2in$
Work Step by Step
Since the two triangles are similar we know that the ratio of the sides is the same, thus $\frac{8}{10}=\frac{x}{4}\\x=4\cdot0.8=3.2in$
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 10 - Geometry - Chapter 10 Test - Page 684: 5
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