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Angle measures refer to the amount of rotation between two rays that share a common endpoint called the vertex. They are usually measured in degrees or radians.
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Degree: A unit for measuring angles where one complete revolution is divided into 360 equal parts.
Radian: A unit for measuring angles based on the radius of a circle, where one complete revolution is equal to 2π radians.
Vertex: The common endpoint shared by two rays forming an angle.