Răspuns :
L= lungimea
l=latimea = 2L/3
P = 2 l +2 L = 4L/3+ 2L = 80
4L+6L=80*3
L= 240 /10 = 24
l= 2*24/3 = 16
diagonala d² = 24²+ 16² = 832
d=2³√13
l=latimea = 2L/3
P = 2 l +2 L = 4L/3+ 2L = 80
4L+6L=80*3
L= 240 /10 = 24
l= 2*24/3 = 16
diagonala d² = 24²+ 16² = 832
d=2³√13