# Arc Definition

In geometry, an **arc **is defined as the **portion or part of a circle’s circumference**. Moreover, you can find this arc in other geometrical shapes like ellipse, but it refers to circles in most scenarios.

To neglect this mistake, it is also called a circular arc. For example, if a small curve line is drawn from point B to C, it is called an arc, and the distance b**etween both curve points** is known as **arc length**.

For a more precise understanding, let see the diagram listed below:

**Note:**

To calculate arc length, you can use our Arc Length Calculator.