Răspuns :
L = 180 cm
l = 180:3 = 60cm
P = 2 x (L+l) = 2 x (180+60) = 2 x 240 = 480 cm
l = 180:3 = 60cm
P = 2 x (L+l) = 2 x (180+60) = 2 x 240 = 480 cm
L = 180 = 3l => l = 180 : 3 = 60 cm
P = 2l + 2L = 2·60 + 2·180 = 120 + 360 = 480 cm
P = 2l + 2L = 2·60 + 2·180 = 120 + 360 = 480 cm