An **angle** is a combination of two rays (half-lines) with a common endpoint.

The latter is known as the **vertex of the angle** and the rays as the **sides,** sometimes as the *legs* and sometimes the *arms* of the angle.

We use numerical measurement called **degree** to measure angles. We use the notation **a˚**to denote **a degrees. **The rays OA and OB are called the **sides **of the angle and O is called the **vertex** if the angle. The angle subtended by the rays OA and OB is denoted by ∠AOB.

An instrument used to measure the angles is called protractor.

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