Answer
AB=2$\sqrt 5$
Work Step by Step
$\frac{AB}{AD+DC}$=$\frac{AD}{AB}$
AB$^2$=20
AB=2$\sqrt 5$
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 - Review Exercises - Page 263: 31c
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