Answer
CD=3
Work Step by Step
CD(CD+ED)=AC(BC)
CD$^2$+12CD=45
CD$^2$+12CD-45=0
(CD+15)(CD-3)=0
CD=3
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 6 - Review Exercises - Page 319: 24h
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