## Elementary Geometry for College Students (5th Edition)

$11.1$ in.
$\frac{\sin70^{\circ}}{12}=\frac{\sin60^{\circ}}{x}$ $\sin70^{\circ}x=12\sin60^{\circ}$ $x=\frac{12\sin60^{\circ}}{\sin70^{\circ}}$ $x\approx11.1$