Three points that are not on a straight line will intersect on a plane; A straight line and a point outside it must be a * * * plane; Two parallel straight lines must face * * *; When four points connect into two straight lines and intersect, they must be * * * planes; If there is a three-point * * * line and the fourth point is on this line, then the four-point * * * line must be * * *.

1. What are the methods to judge the plane of two straight lines in space?

The methods to judge the planes of two straight lines in space are: whether three points of a straight line define a plane, whether a straight line and a point outside the straight line define a plane, whether two intersecting straight lines define a plane, and whether two parallel lines define a plane.

This belongs to the solid geometry in compulsory 2 of senior high school mathematics, in which there are only three situations (not to discuss the case of coincidence) in the position relationship of any two straight lines in space: parallel, intersecting (vertical) and different planes.

Second, how to improve high school math scores:

1, master the knowledge first, and then brush the questions.

Understand the basic knowledge before brushing the questions, and understand the basic formulas, theorems and mathematical terms in advance. Remember this sentence, brushing questions is learning knowledge. If you don't even know the knowledge points, just brush them, don't, really don't, it's useless at all, it's just a fake effort, and in the end you can't even remember the knowledge points, formulas and theorems.

It's really important to sum up the problem.

Every classic topic should be carefully analyzed, and the following questions should be recorded: purpose conditions, hidden conditions, and how to see hidden points? How did the problem-solving ideas come from? Formulas, definitions or knowledge points used. Although summarizing is troublesome, it can help you improve your academic performance as soon as possible.

3. Wrong problem sets and study notes.

You must prepare wrong problem books and study notes in high school mathematics study, and you can't just do problems, because there are too many math problems in high school, and people with poor math foundation can do them slowly, but not too many problems. It is the key to summarize the ideas and skills of solving problems through wrong questions.