Algebra 1: Common Core (15th Edition)

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



Work Step by Step

Using the Pythagorean theorem to find c: $a^2+b^2=c^2$ Plug in the given values: $21^2+20^2=c^2$ $c^2=841$ $c=29$
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