Question

STUVWXYZ is a rectangular cuboid. Find the angle between SY and plane STUV(angle YSU).

Answer 1

In $\Delta$ SVY

$\tan \angle ysu=\frac{yu}{su}$

$\tan \angle ysu=\frac{21}{18.6}$

$\angle ysu={\tan }^{-1}1.129$

$\angle ysu={48.467}^o$.