There are four types of cylindrical billiards, which are common geometric bodies in space.
plane
The mathematical plane is not defined, but the image describes the meaning. Move a straight line to check the planes, and the planes intersect into a straight line.
It is most common to determine a plane from three points of a straight line.
The mathematical plane is not defined, and the image description is not difficult. Move a straight line to check the planes, and the planes intersect into a straight line.
It is most common to determine a plane from three points of a straight line.
Drawing method of plane
You can't draw the whole plane, but a part. Most of them are parallelograms, and the aspect ratio is 2 1.
The acute angle should be 45 degrees, often placed horizontally.
Plane representation
Lowercase Greek letters, oblique writing in English.
Determine the plane
Determine three inferences of the plane, a point outside the straight line; Two intersecting parallel lines can define a plane.
Huajiao line
When drawing a section line on an intersecting plane, finding three points is the key. The intersection line sees a point, which is regarded as the end of the light.
There are no points on the intersection line, and two points on the plane are straight lines. The intersection of straight lines is fixed. Draw some rays on the plane.
The positional relationship of spatial straight lines