[tex]a)~\triangle MPB~si~\triangle NRC~dreptunghice[/tex]
[tex][MB]\equiv[NC][/tex]
[tex]\angle MBP\equiv\angle NCR[/tex]
[tex]\triangle MBP\equiv\triangle NCR,~caz~IU\Rightarrow[BP]\equiv[CR][/tex]
[tex]b)~Din~a~rezulta~[MP]\equiv[NR][/tex]
[tex]\triangle MPR~si~\triangle NRP~dreptunghice[/tex]
[tex][MP]\equiv[NR][/tex]
[tex][PR]\equiv[RP][/tex]
[tex]\triangle MPR\equiv\triangle NRP,~caz~CC\Rightarrow[MR]\equiv[NP][/tex]
