What is a cylinder and what are the cylinders

If the cylindrical plane is cut off from the rotating plane, then the geometry enclosed by the two sections and the rotating plane is called a cylinder, that is, a cylinder.

Properties of the cylinder:

1. The two round surfaces of the cylinder are called the bottom surface, and the surrounding surfaces are called the sides, and a cylinder is composed of two bottom surfaces and one side.

2. The two bottom surfaces of the cylinder are exactly the same two circular surfaces. The distance between the two bottom faces is the height of the cylinder.

3. The side of the cylinder is a curved surface, and the figure of the side of the cylinder is a rectangle, square or parallelogram.

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There are two undersides, one side.

There is a fixed line and a moving line in the same plane, when this plane rotates around this fixed line, the surface formed by this moving line is called the rotating surface, this fixed line is called the axis of the rotating surface, and this moving line is called the bus bar of the rotating surface. If the bus is a straight line parallel to the axis, then the resulting rotating surface is called a cylindrical surface. If the cylindrical surface is truncated by two planes perpendicular to the axis, then the geometry enclosed by the two sections and the cylindrical surface is called a straight cylinder, referred to as a cylinder.

The cylinder, in turn, can be seen as the result of a rectangle rotating around one side of it.

A cylinder is made up of two bottom surfaces and one side.

The two undersides of a cylinder are two circles that are exactly the same.

The distance between the two bottom faces is the height of the cylinder.

A cylinder has an infinite number of axes of height and symmetry.

The side of the cylinder is a curved surface.

The side area of the cylinder = the circumference of the bottom surface x the height.

S side = surface area of ch cylinder = side area + bottom area x 2 volume of cylinder = base area x height.

The volume of a cylinder of equal height with a base of v=sh is 3 times that of a cone.

Cylinders are divided into straight cylinders and oblique cylinders, and their characteristics are as follows:

Straight cylinders are also called regular cylinders, cylinders, which have the following properties:

(1) The two undersides of a straight cylinder are circles of equal radius;

(2) The two bottom surfaces of the straight cylinder, the line of the center of the circle and the two bottom surfaces perpendicular to each other;

(3) The side view of the straight cylinder is rectangular.

Straight cylindrical. Oblique cylinders have the following properties:

(1) The two bottom surfaces of the oblique cylinder are circles of equal radius;

(2) The line of the center of the two bottom surfaces of the oblique cylinder and the two bottom surfaces are not perpendicular;

(3) The side view of the oblique cylinder is a parallelogram.

Oblique cylindrical.

The characteristics of the cylinder are: the cylinder has two bottom surfaces and one side, the bottom surface is exactly the same two circles, the side is a curved surface, and the height is a rectangle or square; The base of the cone is a circle, and its side is a curved surface.

Questions. Features of the cone.

The characteristics of the cone are 1. The side is a fan-shaped. 2. Only the bottom is round.

Questions. What's your name? [Year of the Tiger] [Year of the Tiger] [Year of the Tiger] [Year of the Tiger] Dear, the teacher's name is Su Mo.

Differences:

1. Figure: 1) The side view of the cylinder is rectangular (or square) and the positive section is also rectangular (or square), and the upper and lower bottom surfaces are equal.

2) The side of the cone, the opening of the cave is fan-shaped, the front section is also triangular, and the upper and lower surface of the cylinder is reduced to a point to become a cone.

2. Bottom surface: 1) The top of the cylinder is also a bottom surface.

2) Above the cone is a vertex.

3. Vertices: 1) The cone has vertices;

2) The cylinder has no vertices.

The cylindrical hail shed is a three-dimensional drawing wheel shape, which is expressed in three-dimensional space (modeling), and has the elements of three-dimensional graphics.

The cylindrical shape is also a three-dimensional figure, but it is expressed in the plane (we usually draw it on paper), if you don't understand, you can ask the teacher.

Best wishes. Please adopt it in time. Thank you.

To answer this eggplant-shaped question, we must first understand what a cylinder is. Rotate a rectangular piece of cardboard around one side of it, and what you get from one rotation is a cylinder, also called a straight cylinder. It has one side and two undersides; And if there is only one underside and side or only one side, we can only say like a cylindrical shape, which is called a cylindrical shape.

It is rare in life for a concrete object to be completely consistent with the concept of "cylinder". Therefore, it is customary to refer to objects with the shape of a cylinder as "cylinders" or "cylinders" as an abstract concept. A cylinder is a three-dimensional figure that is represented in three-dimensional space (modeling) and has elements of a three-dimensional figure.

The cylindrical shape is also a three-dimensional figure, but it is expressed in a flat surface (which we usually draw on the triddle guessing paper).

The cylinder is three-dimensional, three-dimensional, such as a water cup. The cylinder is two-dimensional planar.

I think the cylinder is a flat figure, and the cylinder is a three-dimensional shape.

Mathematically, a cylinder and a cylinder are the same, they are both three-dimensional figures.

The cylinder is three-dimensional The cylinder is not three-dimensional.

Cylinders and cylinders do not mean the same thing, cylinders are three-dimensional figures, represented in three-dimensional space (modeling), with elements of three-dimensional figures. The cylindrical shape is also a three-dimensional figure, but it is expressed in the middle of the plane. The side view of the cylinder is rectangular (or square) and the regular section is also rectangular (or square) with equal upper and lower bottom surfaces.

Straight cylinders are also called regular cylinders, cylinders, which have the following properties:

(1) The two undersides of a straight cylinder are circles of equal radius;

(2) The two bottom surfaces of the straight cylinder, the line of the center of the circle and the two bottom surfaces perpendicular to each other;

3) The side view of the straight cylinder is rectangular.

Oblique cylinders have the following properties:1) The two bottom surfaces of the oblique cylinder are circular states of equal radius;

(2) The line of the center of the two bottom surfaces of the oblique cylinder and the two bottom surfaces are not perpendicular;

(3) The side view of the oblique cylinder is a parallelogram.