Luas Segitiga

\begin{equation*}
\begin{split}
L & = \tfrac 12 \:.\: 4 \;.\: 6 \;.\: \sin 60^{\text{o}}  \\\\
L & = \tfrac 12 \:.\: 4 \;.\: 6 \;.\: \tfrac 12 \sqrt{3}  \\\\
L & = 6 \sqrt{3}
\end{split}
\end{equation*}