## Elementary Geometry for College Students (7th Edition)

Published by Cengage

# Chapter 5 - Section 5.3 - Proving Lines Parallel - Exercises - Page 245: 40

AB=4

#### Work Step by Step

$\frac{AB}{AD}$=$\frac{AC}{AB}$ $\frac{AB}{2}$=$\frac{8}{AB}$ AB$^2$=16 AB=4

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