1 Make a circular iron drum without a cover, with a height of 20DM and a bottom diameter of 12DM. How many square MD does this universal iron drum need to be made?

2 Cut the bottom of a cylinder with a surface radius of 3CM into two identical cylinders. How much surface area has been added?

The height of the cylinder is 10 cm. When the cylinder is cut in half along the bottom diameter, the surface area increases by 40 cm. What is the surface area of a cylinder in square centimeters?

4 An original painting has a base diameter of 8DM and a height of 3DM. How many square decimetres does the surface area increase by cutting the cylinder in half along the bottom diameter of the cylinder?

The lateral area of a cylinder is a square with a side length of 15.7CM. What is the surface area of this cylinder in square centimeters?

6 beverage cans, height 18M, floor diameter 6M. How much wrapping paper does it take to pack 100 pieces?