[tex]\bf \textit{Law of Cosines}\\\\
c^2 = a^2+b^2-(2ab)cos(C)\implies
c = \sqrt{a^2+b^2-(2ab)cos(C)}
\\\\\\
\cfrac{a^2+b^2-c^2}{2ab}=cos(C)\implies cos^{-1}\left(\cfrac{a^2+b^2-c^2}{2ab}\right)=\measuredangle C\\\\
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\begin{cases}
x=24\\
a=25\\
b=19
\end{cases}\implies cos^{-1}\left(\cfrac{25^2+19^2-24^2}{2(25)(19)}\right)=\measuredangle x
\\\\\\
cos^{-1}\left( \cfrac{41}{95} \right)=\measuredangle x\implies 64.432194^o\approx \measuredangle x[/tex]
