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**Introduction**

**Angle an angle is a figure formed by two rays with the same initial point.**

**Naming an angle**

**Angle as rotation of a ray.**

**Magnitude of an angle the magnitude of an angle is the amount of rotation through which one of the arms must be rotated about the vertex to bring it to the position of the other arm.**

**Comparison by inspection**

**Comparison of angles by using trace paper.**

**Interior of an angle**

**Exterior of an angle**

**Straight angle **