Deoarece[tex]3^2+4^2=5^2=>AB^2+AC^2=BC^2=>\ Reciproca\ teoremei \ lui \\
Pitagora=>\triangle ABC \ dreptunghic \ in \ A[/tex]
Aplicam formula inaltimii in triunghiul dreptunghic:
[tex]h= \frac{c_1\cdot c_{2}}{ip} =\frac{AB\cdot AC}{BC}= \frac{3 \cdot4}{5} = \frac{12}{5} [/tex]
