AJUTATI MA VA ROG !
EXERICITUL 14!

[tex]\it a)\ \ \mathcal{P}=2\cdot(AN+ND)=2\cdot(2\cdot4+2\cdot5)=2\cdot18=36\ cm\\ \\ \\ b)\ \ \mathcal{P}=2\cdot(AN+ND)=2\cdot(6+7)=2\cdot13=26\ cm[/tex]