2. Then draw a straight line on the left of the ellipse. A vertical straight line;

3. Then draw a vertical line on the right side of the ellipse;

4. Finally, draw an ellipse at the bottom of two vertical lines to connect Suxian County;

5. Draw such a cylinder, as shown in the following figure:

Cylindrical property

1. The two circular surfaces of a cylinder are called the bottom surface, and the surrounding surfaces are called the side surfaces. A cylinder consists of two bottom surfaces and one side surface.

2. The two bottom surfaces of a cylinder are two identical circular surfaces. The distance between the two bottom surfaces is the height of the cylinder.

3. The side surface of the cylinder is a curved surface, and the development diagram of the side surface of the cylinder is a rectangle, a square or a parallelogram (diagonal cutting).