[tex]\it a)\ \ Compar\breve am\ \ \Delta MNP\ \ cu\ \ \Delta QPN\\ \\ \\ \ [MN] \equiv[QP]\ (ipotez\breve a)\ \ \ \ \ \ \ (1)\\ \\ \ [NP] \equiv[NP]\ (latur\breve a\ \ comun\breve a)\ \ \ \ \ \ (2)\\ \\ \ [MP] \equiv[QN]\ (ipotez\breve a)\ \ \ \ \ \ \ (3)\\ \\ \\ (1),\ (2),\ (3)\ \stackrel{LLL}{\Rightarrow}\ \Delta MNP\ \equiv\ \Delta QPN[/tex]
[tex]\it b)\ \Delta MNP \equiv \Delta QPN \Rightarrow \widehat{QPN}\equiv \widehat{MNP}\\ \\ c)\ \Delta MNP \equiv \Delta QPN \Rightarrow \widehat{MPN}\equiv \widehat{QNP}[/tex]
În două triunghiuri congruente, la laturi congruente se opun
unghiuri congruente.
