[tex]P_{KLPN}=24\Rightarrow 24=\dfrac{MN}{2}+KL+\dfrac{MP}{2}+NP\Rightarrow[/tex]
[tex]\Rightarrow 24=5+KL+7+2KL\Rightarrow 3KL=12\Rightarrow KL=4\ cm\Rightarrow NP=8\ cm[/tex]
[tex]P_{MNP}=NM+MP+NP=10+14+8=32\ cm.[/tex]
Am folosit faptul ca in triunghiul MNP, KL este linie mijlocie , deci NP=2KL.