Daca m<(C)=[tex] 90^{o} [/tex] at. triunghiul ABC- triunghi dreptunghic
in triunghi dreptunghic avem- Teorma lui Pitagora=> [tex] ipotenuza^{2}=cateta1^{2}+cateta2^{2} =\ \textgreater \
AB^{2}=AC^{2}+BC^{2}[/tex]
[tex]AB^{2}=5^{2}+12^{2} =\ \textgreater \
AB^{2}=25+144 =\ \textgreater \
AB^{2}=169 =\ \textgreater \
AB= \sqrt{169} [/tex]
AB=13 cm
