Answer
$c=29$
Work Step by Step
Using the Pythagorean theorem to find c:
$a^2+b^2=c^2$
Plug in the given values:
$21^2+20^2=c^2$
$c^2=841$
$c=29$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 10 - Radical Expressions and Equations - Chapter Test - Page 657: 25
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