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$\sqrt 2$
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 11 - Surface Area and Volume - Get Ready! - Page 685: 2
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