- Area $=\dfrac{1}{2}\times$ base $\times$ height
- Area $=\dfrac{1}{2}ab\sin C$
- Heron’s Formula
Define $s=\dfrac{a+b+c}{2}$. Then
\begin{equation*}
\mbox{Area} = \sqrt{s(s-a)(s-b)(s-c)}
\end{equation*}
Area of Triangle
Resources for HKDSE Mathematics
