Answer
AB$\approx$7.74
Work Step by Step
AB=$\sqrt {(BD)(DC)}$
AB=$\sqrt {60}$
AB$\approx$7.74
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 5 - Section 5.1 - Ratios, Rates, and Proportions - Exercises - Page 227: 22a
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