1. Know what an angle is. An angle is a graph formed by the intersection of two rays or line segments. Draw an angle on paper, and it is easy to see that it is composed of two rays or line segments.

2. Learn how to calculate the angle. The method of calculating the angle is simple. Start from the vertex of the angle, draw an arc along both sides of the angle, and then count how many such arcs intersect. If the arcs intersect to form two independent angles, then this angle is called dihedral angle.

3. Practice counting angles. You can draw some simple figures on paper, such as triangles, squares, rectangles, etc. , and then try to count the number of angles contained in it. You can also find some more complicated figures, such as pentagons and hexagons, and try to count the angles involved.

Knowledge of counting angle

1, counting angles refers to the process of dividing a ray or line segment from the vertex of an angle to form multiple angles. There are many ways to calculate the angle, among which the common method is division, that is, dividing an angle into several small angles, then calculating the degree of each small angle separately, and finally summing up to get the total degree. In addition, there are angle counting methods such as degree method and folding method.

2. Counting angles are widely used in mathematics. For example, in geometry, we need to calculate the sum of the inner and outer angles of a polygon. In trigonometric function, we need to calculate the trigonometric function value such as angle. Therefore, mastering the method of counting angles is very important for learning mathematics.

3. When learning to calculate angles, we should pay attention to the following points: First, we should make clear the definition and concept of angles and understand the characteristics and properties of different types of angles (such as acute angle, right angle, obtuse angle, etc.). ). Secondly, we should master the basic methods of calculating the angle, such as dividing method, measuring method and folding method, and use them flexibly.