A: The area of trademark paper is 50.24 square decimeters.
(2) Transverse area of oil drum: 3. 14×4×4=50.24 (square decimeter).
Oil drum bottom area: 3.14× (4÷ 2) 2× 2 = 3.14× 22× 2 = 25.12 (square decimeter).
Surface area of oil drum: 50.24+25. 12=75.36 (square decimeter)
A: The surface area of the oil drum is 75.36 square decimeters.
(3)3. 14×(4÷2)2×4×0.8
=50.24×0.8
=40. 192 (kg)
A: This oil drum can hold 40.192kg of oil.