Answer
One reason for the semiperimeter to be labeled $s$ is that it follows the logic of other variables used with triangles.
Work Step by Step
Usually, triangles have $A$ representing the area and $P$ representing the perimeter.
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 10 - Section 10.6 - Radical Equations and Problem Solving - Exercise Set - Page 732: 78
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