# Angle Definition

In geometry, an **angle **is defined as the** amount of turn formed between two lines**. Whereas, **these two lines** are known as **arms of the vertex**, and at the **joint end where these arms meet** is called the **vertex of an angle**.

A symbol used to represent an angle is **'∠'**. Moreover, the word angle is driven from the Latin word "Angulus". The SI unit to measure an angle in degree, symbolized as **"°"**.

Usually, these degrees of an angle are calculated using a protector. For instance, if two different lines meet at the same point, an angle formed between them can be measured using a protector and written in forms like 30°, 45°, 60°. In addition, there are many types of angles based on angle's value in degree.

For example, if two lines form an angle of 90°, it can be called a right-angle triangle. For a more precise understanding, check out an image attached below:

**Note:**

If you want to know about angles, you can use our Arm Of An Angle Definition.