## complementary angles

### Complementary angles are a pair of angles that add up to 90 degrees

Complementary angles are a pair of angles that add up to 90 degrees. In other words, when you have two angles that are complementary, their measures together create a right angle.

For example, let’s say we have Angle A and Angle B. If Angle A measures 30 degrees, then Angle B would measure 60 degrees, since 30 degrees + 60 degrees equals 90 degrees.

Complementary angles are often found when working with right triangles. In a right triangle, one of the angles measures exactly 90 degrees, which means the other two angles are complementary.

Complementary angles can be identified by their relationship when they are adjacent (sharing a vertex and a side) or when they are not adjacent. When two angles are adjacent and complementary, they are called a linear pair. In this case, the angles are both adjacent and together form a straight line.

It is important to note that complementary angles can be found in various orientations. They can be next to each other, forming a right angle, or they can be separated by other angles.

To find the measure of a complementary angle, you can subtract the measurement of one angle from 90 degrees. For example, if you have an angle that measures 40 degrees, you can find its complement by subtracting 40 from 90, which gives you 50 degrees.

Complementary angles have several applications in geometry and trigonometry, such as in solving equations involving right triangles, calculating angles in real-world problems, and working with trigonometric functions like sine and cosine.

In summary, complementary angles are a pair of angles that add up to 90 degrees. They are often seen in right triangles and can be adjacent or separated by other angles. Identifying and working with complementary angles is crucial in many mathematical applications.

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