# Types of Angles

From the title it comes to your mind that there are different kinds of angles, right?

Yes, there are many types of angles that we will learn about in this lesson with the definition and measurement of each type of angle.

But what is the angle? What is it made of? An angle is two rays (legs) that have the same endpoint. This common endpoint is called the **vertex**, and the space between the two legs is the measure of the angle. The unit of measure for angles is the **degree** (there are other units).

In this lesson you will find each angle with its name, description and the geometric representation.

## Acute Angle

Each angle that measure is less than 90°.

## Right Angle

An angle that measure is exactly 90°.

## Obtuse Angle

Each angle that measure is greater than 90° and less than 180°.

## Straight Angle

An angle that measure is exactly 180°.

## Reflex Angle

Each angle that measure is greater than 180° and less than 360°.

## Full Angle

An angle that measure is exactly 360°.

## Complementary Angles

Two angles that add up 90°.

## Supplementary Angles

Two angles that add up 180°.

## Adjacent Angles

Angles with a common sdie and a common vertex.

The angles and are adjacent angles.

## Opposite Angles

Angles that have a common vertex and whose arms are formed by the same lines. Opposite angles are equal

The angles and are opposite angles, therefore:

The angles and are opposite angles, therefore: