"∞" means "angle", followed by the corresponding Greek letter.

Angle α, written as ∠а

Jiao Ga, written as ∠ γ.

Angle β, recorded as ∠ β.

The way to learn math well is as follows:

First, master the basic knowledge, which is the basis of learning mathematics well.

Although mathematics is difficult for many students, for students who want to learn mathematics well, the first thing to do is to master the basic knowledge, which is the basis of learning mathematics well. The basic knowledge of mathematics is generally the knowledge of some concepts and formulas. Only by mastering these clearly can students have a good application and mathematics be improved.

Second, think more, thinking is the key to flexible use of knowledge.

Mathematics is a subject that attaches great importance to the logical thinking ability, so students should use knowledge flexibly in the process of learning, which is the key factor to learn mathematics well. Students' thinking is exercised in the process of continuous thinking. Only by thinking deeply often can their thinking be more active and their mathematics learning be easier.

Third, listen carefully in class.

It is also an important link to listen carefully in class if you want to learn math well. In class, the teacher usually talks about the idea of doing the problem and some expanded knowledge. If students can keep up with the teacher's thinking in class, then on the whole, such students have good math scores, so if they want to do well in math, they should listen carefully in class.

Fourth, do more exercises and develop good problem-solving habits.

If you want to learn math well, it is inevitable to do more problems. Doing more questions does not mean engaging in sea tactics. The topic to be done should be representative and the difficulty of the topic to be done should be moderate. Try to draw inferences by doing some representative topics. Problem-solving should be organized, learn to skillfully use correct problem-solving methods in the process of solving problems, and master the problem-solving rules of some basic problems.