From Mechanics
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\displaystyle \tan \alpha =\frac{V}{H}
Here
\displaystyle V=-10\ \text{N}
and
\displaystyle H=9\ \text{N}.
Thus
\displaystyle \tan \alpha =\frac{-10}{9}=-1\textrm{.}1
giving
\displaystyle \alpha =-48{}^\circ
