## Elementary Geometry for College Students (7th Edition) Clone

$w = 18.5$ units
$w^{2} = (14)^{2} + (21)^{2} - 2(14)(21)cos(60)$ $w^{2} = 196 + 441 - 588cos(60)$ by GDC / calculator $w^{2} = 637 - 294$ $w^{2} = 343$ $w = \sqrt {343}$ $w = 18.5202...$ units $w = 18.5$ units