Answer
9
Work Step by Step
$\sqrt 81=9$, because $9^{2}=9\times9=81$
Basic College Mathematics (10th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0134467795
ISBN 13:
978-0-13446-779-5
Chapter 8 - Geometry - 8.8 Pythagorean Theorem - 8.8 Exercises - Page 591: 4
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