## Angle

### In mathematics, an angle is a figure formed by two rays or lines that emanate from the same point called the vertex

In mathematics, an angle is a figure formed by two rays or lines that emanate from the same point called the vertex. The two rays are called the sides of the angle. Angles are typically measured in degrees or radians and are used to describe the amount of rotation or separation between the two rays.

There are several ways to classify angles based on their measurements:

1. Acute Angle: An acute angle is an angle that measures less than 90 degrees. It is smaller than a right angle.

2. Right Angle: A right angle is an angle that measures exactly 90 degrees. It forms a perfect L shape.

3. Obtuse Angle: An obtuse angle is an angle that measures greater than 90 degrees but less than 180 degrees. It is larger than a right angle.

4. Straight Angle: A straight angle is an angle that measures exactly 180 degrees. It forms a straight line.

5. Reflex Angle: A reflex angle is an angle that measures greater than 180 degrees but less than 360 degrees. It is larger than a straight angle.

Angles can also be classified based on their relationship with other angles:

1. Complementary Angles: Two angles are said to be complementary if their sum is exactly 90 degrees. For example, angles measuring 30 degrees and 60 degrees are complementary.

2. Supplementary Angles: Two angles are said to be supplementary if their sum is exactly 180 degrees. For example, angles measuring 120 degrees and 60 degrees are supplementary.

3. Vertical Angles: Vertical angles are formed when two lines intersect. They are opposite each other and have equal measures. For example, when two lines cross, the angles formed on the opposite sides of the intersection are vertical angles.

4. Adjacent Angles: Adjacent angles are angles that share a common side and a common vertex, but do not overlap. They cannot have the same interior points. For example, in a rectangle, the angles opposite to each other and sharing a common side are adjacent angles.

Understanding angles and their classifications is fundamental in geometry and trigonometry, as they help us measure and describe the orientation and relationships of lines and shapes.

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