Teorema Pythagoras

BC adalah sisi miring, jadi:

\begin{equation*}
\begin{split}
\text{BC}^2& = \text{AB}^2 + \text{AC}^2\\\\
\text{BC}^2& =15^2 + 8^2\\\\
\text{BC}^2& =225 + 64\\\\
\text{BC}^2& =289\\\\
\text{BC}& = \sqrt{289}\\\\
\text{BC}& = 17 \text{ cm}
\end{split}
\end{equation*}