Răspuns :
L=20
l/L=4/5
l/20=4/5 => l=20*4/5= 4*4=16
P=2l+2L= 2*16 +2*20= 32 +40=72
l/L=4/5
l/20=4/5 => l=20*4/5= 4*4=16
P=2l+2L= 2*16 +2*20= 32 +40=72
L = 20 cm
l = 4/5 * L
l = 4/5 *20 = 80 / 5 = 16
l = 16 cm
P = 2L + 2 l
P = 2 * 20 + 2 * 16
P = 40 + 32
P = 72 cm
l = 4/5 * L
l = 4/5 *20 = 80 / 5 = 16
l = 16 cm
P = 2L + 2 l
P = 2 * 20 + 2 * 16
P = 40 + 32
P = 72 cm