Czołem!
1)
a = 35 m
b = 25 m
Ob = 2 * 35 + 2 * 25 = 70 + 50 = 120 m
2)
a = 14 km
b = 10 km
Ob = 2 * 14 + 2 * 10 = 28 + 20 = 48 km
3)
a = 110 mm = 11 cm
b = 7 cm
Ob = 2 * 11 + 2 * 7 = 22 + 14 = 36 cm
4)
a = 90 cm = 9 dm
b = 4 dm
Ob = 2 * 9 + 2 * 4 = 18 + 8 = 26 dm