#### Answer

8$\sqrt 2$

#### Work Step by Step

We use the Pythagorean Theorem:
$a^{2}$+$b^{2}$=$c^{2}$
$a^{2}$+$4^{2}$=$12^{2}$
$a^{2}$+16=144
$a^{2}$=128
a=8$\sqrt 2$

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Published by
Prentice Hall

ISBN 10:
0133281159

ISBN 13:
978-0-13328-115-6

8$\sqrt 2$

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