Răspuns :
[tex]\it \mathcal{P}=3\ell=\dfrac{2}{7}\cdot2142 \Rightarrow 3\ell=2\cdot306\bigg|_{:3} \Rightarrow \ell=2\cdot102=204\ cm[/tex]
[tex]\it \mathcal{P}=3\ell=\dfrac{2}{7}\cdot2142 \Rightarrow 3\ell=2\cdot306\bigg|_{:3} \Rightarrow \ell=2\cdot102=204\ cm[/tex]