Answer
A=336
Work Step by Step
s=.5(26+28+30)=42
A=$\sqrt {s(s-a)(s-b)(s-c)}$
A=$\sqrt {42(16)(14)(12)}$
A=$\sqrt 112,896$
A=336
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: 5
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