Răspuns :
L=2l+18. ,2l+2L= 420 ; 2l+2(2l+18)=2l+4l+36=420. ,6l=420-36=384 ,l=384:6=64m (latimea). Iar L=2*64+18 ,L=146m
P=420m
L=18+2l
P=2L+2l
P=2(18+2l)+2l
P=36+4l+2l
P=36+6l
420=36+6l
384=6l
l=64
L=146
L=18+2l
P=2L+2l
P=2(18+2l)+2l
P=36+4l+2l
P=36+6l
420=36+6l
384=6l
l=64
L=146