Aplicam teorema inaltimii:
Inaltimea este media geometrica a segmentrlor determinate de ea pe ipotenuza.
[tex]h = \sqrt{BD \times CD} = \sqrt{4 \times 6} = \sqrt{4\times 6} =\boxed{2\sqrt{6}}~~~\texttt{cctd} \\ \\
\Longrightarrow~~~ \text{Se verifica teorema inaltimii.} \\ \\
\Longrightarrow~~~ \boxed{\Delta ABC ~\texttt{ este dreptunghic in A}}[/tex]