Answer
$61.0^\circ$
Work Step by Step
Use $\sin{\theta} = \frac{\text{opposite}}{\text{hypotensue}}$ to obtain
$\sin{(\theta)}=\frac{10.5}{12}=0.875.$
Use inverse sine to find the value of $\theta$:
$\theta=\sin^{-1}{(0.875)}\approx 61.0^\circ$
