Answer
AB=4
Work Step by Step
$\frac{AB}{AD}$=$\frac{AC}{AB}$
$\frac{AB}{2}$=$\frac{8}{AB}$
AB$^2$=16
AB=4
Elementary Geometry for College Students (6th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
9781285195698
ISBN 13:
978-1-28519-569-8
Chapter 5 - Section 5.3 - Proving Lines Parallel - Exercises - Page 233: 40
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