Answer
$13$
Work Step by Step
$169$ is a perfect square, so we take the square root of $169$ to solve:
$\sqrt {169} = 13$
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 6 - Polygons and Quadrilaterals - Algebra Review - Page 399: 10
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