[tex]Notam~a=6~cm;~b=8~cm~si~c=10~cm. \\ \\ Observam~ca~c^2=100,~iar~a^2+b^2=36+64=100,~adica~ \\ \\ a^2+b^2=c^2 \Rightarrow Triunghiul~este~dreptunghic~avand~ipotenuza~ \\ \\c=10~cm.~(Teorema~reciproca~a~lui~Pitagora) \\ \\ A_{triunghi}= \frac{ab}{2} = \frac{6 \cdot 8}{2}=24~(cm^2) \\ \\Observatie:~se~mai~putea~utiliza~si~formula~lui~Heron .[/tex]
