Answer
17.78 in
Work Step by Step
The perimeter of a triangle is the sum of the lengths of the 3 sides.
$4.2+5.78+7.8=17.78$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 5 - Section 5.2 - Adding and Subtracting Decimals - Exercise Set - Page 350: 78
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