From Mechanics
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\displaystyle \tan \alpha =\frac{V}{H}
Here
\displaystyle V=8\ \text{N}
and
\displaystyle H=6\ \text{N}.
Thus
\displaystyle \tan \alpha =\frac{8}{6}=1\textrm{.}33
giving
\displaystyle \alpha =53{}^\circ
