Answer
$40cm$
Work Step by Step
The vertical sides are $8$,$5$ and $8-5=3$, the horizontal sides are $12$, $9$ and $12-9=3$, thus the perimeter is: $8+5+3+12+9+3=40$
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 10 - Geometry - Chapter 10 Test - Page 684: 8
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