How to find the degree of angle

The degree method for finding the angle is as follows:

1, sine theorem and cosine theorem can be used together to get the sine and cosine values of the angle, and then the degree of the angle can be deduced.

2. You can also judge the structure of the triangle according to the geometric method, and then you can get the degree of the angle. In geometry, an angle is a geometric object composed of two rays with a common endpoint. The common endpoint is called the vertex of the angle, and two rays are called the two sides of the angle.

Euclid, the father of geometry, once defined an angle as the relative inclination of two non-parallel straight lines in a plane. Proclos thinks that angle may be a trait, a quantifiable quantity, or a relationship. Oldham thinks that an angle is a deviation from a straight line, and Cabus of Antioch thinks that an angle is a space between two intersecting straight lines. Euclid thinks that angle is a relationship.

Related concepts of angle:

1, complementary angle and complementary angle: if the sum of two angles is 90, it is complementary angle, and if the sum of two angles is 180, it is complementary angle. The complementary angles of equal angles are equal, and the complementary angles of equal angles are equal.

2. Vertex relative: After two straight lines intersect, there is only one common vertex, and both sides of the two corners are opposite extension lines. Such two angles are called antipodal angles. Two straight lines intersect to form two pairs of vertex angles. The two opposite angles are equal.

3. Adjacent complementary angles: two angles have a common edge, and their other edge is an opposite extension line. Two angles with this relationship are adjacent complementary angles.