Solution: D= 1.2 m, so R= 1.2/2=0.6 m = 6 decimeters, so the floor space = ∏ R2 = 3.14 * 6 =1.

C = 2 ∏ r = 2 * 3. 14 * 6 = 37.68 decimeter, so the area around the cylinder = c * h = 37.68 * 3 =1kloc-0/3.04 square decimeter.

So the area of the painted part =113.04+113.04 = 226.08 square decimeter.