What lines have been learned in junior high school math and what are the line segments in junior hig

A line segment is a continuous or discontinuous graph line formed by one or more different line elements, which is a finite part between two points on a straight line. I've compiled the knowledge points related to line segments for you, let's take a look.

Refers to a finite portion (including two endpoints) between two points on a line. For example, the line segment of a solid line or a line segment of a two-point long line composed of "long dashes, short intervals, points, short intervals, points, and short intervals".

Connect the two points with a ruler to get a line segment. The length of the line segment is the distance between these two points. A line segment is represented by the letters A, B, or a lowercase letter that denote its two endpoints, and sometimes these letters also indicate the length of the line segment, denoted as line AB or line BA, line A.

where a and b represent the two endpoints of the line segment.

1.Vertical segments in the drawing make the short ones look slimmer and taller, while horizontal segments do the opposite.

2.The line segment is applied to the stereoscopic imaging technology of the line grating liquid and the parallel and sub-imaging of the far and near scenes, as well as the production method of the stereo image.

3.In Chinese painting, line segments play a decisive role in modeling, and the method of brushwork basically determines the changes of line segments and lines.

The ray is for line segments, straight lines, first of all it is straight. An infinitely extended segment of a line is a ray, which has only one endpoint. It can also be said that a ray is a part of a point on one side of a straight line.

Truncation complements the short (You Xiang Hu Qi is suitable for verifying that the sum of two line segments is equal to the other line segment) is a good omen, the construction is congruent, the construction is similar (it is better in itself), the middle line of the right triangle, the median line of the triangle, and the translation of one of the diagonal lines in the isosceles trapezoid, and one of the vertices in the square can be rotated when one of the vertices is at an angle of 45 degrees. I can't come up with any formulas, but I can learn and apply them, and it's easy to associate them when I do more.

The above few have said more complete about the line segment method in geometry, and there is also the function image involved in the function such as the primary function and the quadratic function, especially the combination with the geometric figure that appears in the plane right-angle shirt school coordinate system for the evaluation of the line segment or the servant, according to the function analytic formula to find the coordinates of the two ends of the corresponding line segment, and then use the Pythagorean theorem to solve.

For example, a(a,b)b(c,d), then the line segment ab = (talk about the square of a-b) and (c-d) and re-open the square.

The theory is very abstract, the method is very common, and it is still necessary to solve it through specific problems.

Until the second year of junior high school, there is a certificate triangle congruence.

There is also a triangle similar to the shape of the year, the relationship between the proportion of the line lease segment, the Pythagorean theorem, the middle line of the right triangle is equal to half of the hypotenuse, and the isosceles triangle is three lines in one. (For the time being, I only think about this, I hope it can help you).

1) Not in place, because the line segment between two points is the shortest, and the distance and will not be less than 5.

2) Point C is on AB, because if it is outside AB, the distance must be greater than 5.

100% correct.

1) There is no one, and the line segment between two points is the shortest.

That is, ab = 5cm is the shortest.

5 4 This point does not existc

2) C is on AB, if C is not on AB, then AC+BC 5 because AB+BC=5, C is on AB.

1 Understand that lines are composed of points, and through observation and operation, recognize that points and lines are the most basic graphics 2 Understand the differences and connections between line segments, rays, and straight lines, and master their representation methods 3 Understand two basic conclusions:

Two points determine a line;

Between two points, the line segment is the shortest

High school entrance examination target requirements.

1 Grasp the meaning of straight lines, rays, and line segments, and correctly understand the meaning of the distance between two points 2 Understand the nature of straight lines, line segment axioms (between two points, line segments are the shortest) 3 Know the sum, difference, multiple, minute, and midpoint of line segments, and apply these knowledge to solve problems

The point is to learn to draw two-dimensional axes.

Let ac=x, then cd=4x, db=3x, then there is x+4x+3x=8x=16cm, the solution is x=2cm, then cd=8cm, db=6cm, then ad=10cm, so de=5cm, then be=5+6=11(cm).

Algebra:

Solution: Because ac:cd:db=1:4:3, ac=1 (1+4+3)ab=2 cmcd=4 (1+4+3)ab=8 cm

db=3/(1+4+3)ab=6 cm

And because e is the midpoint of AD.

So ed=1 2ad=1 2(ac+cd)=5cm, so be=ed+db=11cm

Straight line: two, ab, bp

Ray Yu Tang: 7, bp, pb, pc, ac, ca, cb, bc line segments: 6, ap, cp, bp, ac, ab, bc If it helps you, please give a good review, thank you for the hunger group!