If the sum of two angles is a right angle, then these two angles are called complementary angles. One angle is called the complementary angle of another.

∠A

+∠C= 180，∠A=

180 -∠C

Complementary angle of ∠C =180-∠ c.

That is, the complementary angle of ∠ a =180-∠ a.

The nature of complementary angle:

The complementary angles of the same angle are equal. For example: ∠ A+∠C=∠B = 180, ∠ A+∠ C = 180, then: ∠C=∠B.

The complementary angles of equal angles are equal. For example: ∠ A+∠C=∠B = 180, ∠ D+∠ C = 180, ∠ A = ∠ D: ∠ C = ∠.

If an angle is equal to its complementary angle, then it is equal to its complementary angle.

If the sum of two angles is a right angle, then the two angles are complementary.

Angle), referred to as complementary angle, it can also be said that one angle is the complementary angle of another angle.

The complementary angles of the same angle or the same angle are equal.

∠A

+∠C = 90 °,

∠A=

90 -∠C

,

∠C=90 -∠A

That is, the complementary angle of < a = 90-< a,

Complementary angle of ∠C = 90-∠ c.

The nature of complementary angle:

The complementary angles of the same angle are equal.

For example: ∠ A+∠ B = 90,

∠A+∠C=90，

Then: ∠ C = ∠ B.

The complementary angles of equal angles are equal.

For example: ∠ A+∠ B = 90,

∠D+∠C=90，

∠A=∠D

Then: ∠ C = ∠ B.

If an angle is equal to its complementary angle, then it is equal to its complementary angle.

If the sum of two angles is equal to 90 degrees, it is said that the two angles are complementary.

The complementary angles of the same angle or the same angle are equal.