Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 5 - Review Exercises - Page 274: 31c

Answer

AB=2$\sqrt 5$

Work Step by Step

$\frac{AB}{AD+DC}$=$\frac{AD}{AB}$ AB$^2$=20 AB=2$\sqrt 5$
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