Răspuns :
L = 20 m
l = 20 : 2 = 10 m
l = 10 m
P = 2L + 2l = 2 x 20 + 2x 10 = 40 + 20 = 60 m
P = 60 m
l = 20 : 2 = 10 m
l = 10 m
P = 2L + 2l = 2 x 20 + 2x 10 = 40 + 20 = 60 m
P = 60 m