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An **angle** is the section of a plane formed by two rays sharing a common endpoint. The rays are called the sides of the angle, while their endpoint is known as the vertex of the angle.

An angle can also mean the rotation of a ray around its vertex.

The most common units used to represent angles are the degree and the radian, while some others, such as the grad, are also used on occasion.

An angle can also mean the rotation of a ray around its vertex.

The most common units used to represent angles are the degree and the radian, while some others, such as the grad, are also used on occasion.