a)
L = 13 cm
l = 6 cm
P = L · 2 + l · 2
P = 13 · 2 + 6 · 2
P = 26 cm + 12 cm
P = 38 cm
b)
L = 80 m
l = 66 m
P = L · 2 + l · 2
P = 80 · 2 + 66 · 2
P = 160 cm + 132 cm
P = 192 cm
c)
L = 15 km
l = 110 hm
l = 110 hm : 10 = 11 km
P = L · 2 + l · 2
P = 15 · 2 + 11 · 2
P = 30 km + 22 km
P = 52 hm