## Elementary Geometry for College Students (6th Edition)

$x = 8$ units
$x^{2} = (8)^{2} + (12)^{2} - 2(8)(12)cos(60)$ $x^{2} = 16 + 144 - 192cos(60)$ $x^{2} = 160 - 192cos(60)$ $x^{2} = 160 - 96$ $x^{2} = 64$ $x = \sqrt {64}$ $x = 8$ units