There are countless perpendicular lines in a line segment, and if it s wrong, it should be a straigh

There are countless strips. Good people, good people, good things, good things, with the passing of time, people's lives are gradually getting richer, and they don't seem to need to help each other, but there are still many good people and good things around us, and the spirit of Uncle Lei Feng will never be erased. It's a good thing that happened to our class.

Last Friday's afternoon self-study, suddenly two classmates in our class vomited, at this time everyone talked about it, began to commotion, guessed, many people immediately opened the windows around them, breathed fresh air, some people covered their noses, in an instant there were almost no people in the class, it turned out that they all ran to the corridor, only two people who vomited and a few people who helped mop the floor, the only girl who helped mop the floor was Zhu Juan, and the other girls did not want to go in, and even the boys repeatedly postponed, The teacher asked a few boys to go in and mop the floor, but they all said, "Don't do it, don't pull it." But how did they resist the teacher's words, so they had to helplessly, cover their noses and go in to mop the floor, and Zhu Juan She has been helping in the classroom, patiently persevering, and she vomited herself, but he still helped his classmates in the class and cleaned the class, I thought:

Isn't she disgusting? Staying in it all the time, a few boys came out with sad faces, it's weird! After a while, the ground was almost clean, and a few classmates went in, and I walked in slowly, and some classmates said to me

It's tasteless again, it's all clean. But I was still not at ease, so I stood on tiptoe and walked carefully to my seat, and the matter was settled, and everyone returned to the original state. Such a trivial thing, but it reflects the quality of one of our classmates - Zhu Juan, who loves the class and is helpful, and the spirit of Uncle Lei Feng is carried forward in a new generation of newcomers.

That's right, because every point on a line segment can be perpendicular, and there are an infinite number of points on a line segment.

If it's on a plane, there's one, and if it's in space, there's an infinite number of it.

1) In the plane, draw a perpendicular line of the known straight line at a point outside the straight line, and you can draw 1:

The proof is as follows: let the straight line be l, and the point outside the straight line is a, assuming that the point a can make two straight lines perpendicular to l, and the perpendicular feet are b and c respectively, because ab l, ac l, so ab ac, and because ab and ac intersect at the point a, which contradicts ab ac, the null hypothesis is not true, that is, the point a can make one straight line perpendicular to l.

2) In space, draw a perpendicular line of a known straight line a little outside the straight line, and you can draw countless lines:

Because the definition of perpendicularity in space is different from that of a plane, two straight lines do not necessarily intersect, and straight lines on different planes can also be perpendicular, therefore, you can first find the plane perpendicular to point A and L, and according to the direction vector of the straight line in space and the coordinates of point A, the equation of the plane can be determined, and any straight line passing through point A on this plane is perpendicular to L, so there are countless lines.

Features of perpendiculars.

When one of the four corners formed by the intersection of two straight lines is a right angle, that is, the two straight lines are perpendicular to each other, one of the straight lines is called the perpendicular line of the other straight line, and the intersection point is called the perpendicular foot. Perpendicular lines are straight lines. A perpendicular segment is a graph, and the distance from a point to a line is a quantity.

The length from the outer point of the straight line to the perpendicular segment of the straight line, called the distance from the point to the straight line, if two straight lines intersect, and the four corners after the intersection are 90°, then these two straight lines are perpendicular to each other, that is, they are perpendicular to each other.

In the definition of perpendicular lines, only the magnitude of the intersection of two straight lines (90°) is specified, but the position of the two straight lines is not specified. That is, regardless of the position of a straight line, as long as the other line intersects it at an angle of 90°, any one of the lines is a perpendicular line of the other line.

There is only one in the same plane, and there can be countless in space.

If it is in a plane, a point over a straight line can only make a perpendicular line, but there are countless lines in space; For example, if two pens are crossed vertically, this is a way to put one, one pen does not move, and the other pen rotates around the intersection place, which can form an infinite number of position relationships, all of which are vertical.

Draw a perpendicular line of a known straight line a little outside the straight line, and such a perpendicular line can draw an infinite number of this.

In detail, it is the knowledge of high school.

There are also many straight lines called opposite-perpendicular lines.

There is only one that intersects.

Only one vertical line can be drawn in two-dimensional space, and countless lines can be drawn in three-dimensional space.

If it's on a plane, there's one, and if it's in space, there's an infinite number of it.

There is only one on the plane, and there are countless in the space.

I know that the two parallel lines are not in love anymore, just two lines.