Answer
$ a=2*\sqrt {10}$
Work Step by Step
By the Pythagorean Theorem, we know that $a^2+b^2=c^2$,
Plugging in our variables gives,
$a^2+9^2=11^2$,
or $a^2=40$ or $ a=2*\sqrt {10}$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 13, Trigonometric Ratios and Functions - Prerequisite Skills - Page 850: 6
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