#### Answer

12 cm

#### Work Step by Step

The perimeter is the sum of the lengths of the sides.
$3+4+5=12$

Published by
Pearson

ISBN 10:
0321955048

ISBN 13:
978-0-32195-504-3

12 cm

The perimeter is the sum of the lengths of the sides.
$3+4+5=12$

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