1, complementary angle: If the sum of two angles is equal to 90 (right angle), the two angles are said to be complementary angles, that is, each angle is the complementary angle of the other angle. The nature of complementary angle: the complementary angle of the same angle (equal angle) is equal. ∠ A+∠ C = 90, ∠ A = 90-∠ C, and ∠ C = 90-∠ C, that is, ∠ A = 90-∠ A.

2. Complementary angle: If the sum of two angles is equal to 180 (flat angle), the two angles are said to be complementary angles, that is, one of them is the complementary angle of the other. The nature of complementary angle: the complementary angle of the same angle (equal angle) is equal. ∠A+∠C = 180, ∠ A = 180-∠C, the complement angle of ∠ C = 180-∠ C, that is: ∞

3. Relationship between complementary angles: If there is an angle ∠ α, the relationship between ∠βand ∠αis as follows: ∠β+∠α = 90. And there is a ∠ γ, so that ∠βhas the following relationship with it: ∠β+∠γ = 180. Then we can say that γ is the complementary angle of α.

If the sum of two angles is a right angle, then these two angles are called complementary angles; If the sum of two angles is a right angle, then these two angles are called complementary angles. The complementary angles (complementary angles) of the same angle (equal angle) are equal.

The method of learning mathematics is as follows:

1, be diligent

You can't just think with your head when you study math. You must work hard when you study math, because there are many times when you don't understand it, but you may write it by hand.

Homework is very important.

An important way to learn mathematics is to finish the homework assigned by the teacher. It is not enough to just attend classes. Colleagues who finish the homework assigned by the teacher should do more exercises to consolidate after class.

3, do a good job of preview

It is very important to preview before class, so that you can focus on the knowledge points you didn't know during preview and review them in time after class.

4. Summarize the wrong question bank

When learning math, you can use a notebook to record your mistakes and go back and do them again every three days or so. Some wrong questions may be done at that time, but they may be forgotten in a few days, so we should summarize the wrong question bank in time.