Răspuns :
[tex]P = 24 = 2(L + l)[/tex]
[tex]L = l + 2[/tex]
[tex]24 = 2[/tex]
[tex]24 = 2l + 4 + 2l[/tex]
[tex]20 = 4l[/tex]
[tex]l = 5 \: \: cm[/tex]
[tex]L = 5 + 2 = > [/tex]
[tex]7 \: cm[/tex]
[tex]P = 24 = 2(L + l)[/tex]
[tex]L = l + 2[/tex]
[tex]24 = 2[/tex]
[tex]24 = 2l + 4 + 2l[/tex]
[tex]20 = 4l[/tex]
[tex]l = 5 \: \: cm[/tex]
[tex]L = 5 + 2 = > [/tex]
[tex]7 \: cm[/tex]