Algebra 2 (1st Edition)

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


$ 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}$
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