Answer
A=20
Work Step by Step
A=(.5$\times$11$\times$12)-(4$\times$4)-(.5$\times$4$\times$7)-(.5$\times$8$\times$4)
A=66-16-14-16
A=20
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 8 - Review Exercises - Page 385: 17
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