Answer
A=480
Work Step by Step
CD$^2$=BD$^2$-BC$^2$
CD$^2$=256
CD=16
A=CD(BC)
A=16(30)
A=480
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 8 - Review Exercises - Page 395: 1
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