Answer
DC=16
Work Step by Step
$\frac{DC}{BD}$=$\frac{BD}{AD}$
$\frac{DC}{12}$=$\frac{12}{9}$
3DC=48
DC=16
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: 31a
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