Answer
12 cm
Work Step by Step
The perimeter is the sum of the lengths of the sides.
$3+4+5=12$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 1 - Section 1.3 - Adding and Subtracting Whole Numbers, and Perimeter - Exercise Set - Page 28: 52
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