1) has a diameter of 2.3m and a circumference of 2.3Xπ=7.22566 (m).

2) The length is 3m, and the surface area is 3 X 7.22566 = 2 1.6770 (m2).

3) The thickness is 2.5cm, that is, 2.5cm = 0.025m, and the wall volume is 2 1.677 X 0.025=0.542 (m3).

The weight of the drum is related to the density of the material.

1) The cement density is 3 tons/m3, so the weight of this cement barrel is 3×0.542 = 1.63 (tons).

2) The density of cast iron is 7.4 tons/m3, so the weight of this cast iron bucket is 7.4×0.542 = 4 (tons).

3) The density of carbon steel is 7.8 tons/m3, so the weight of this carbon steel barrel is 7.8 X 0.542 =4.2 tons.