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Definition: Angles are formed by two rays that begin at the same point or share the same endpoint. The angle measures the amount of turn between the two arms and is usually measured in degrees or radians. Where the two rays intersect (come together to meet) is called the vertex. The two rays are sometimes referred to as the arms.
Click on an image for a full description of that type and a corresponding interactive applet. Straight angle Also Flat Angle. Definition: An angle whose measure is exactly 180Â° - a straight line. Try this Adjust the angle below by dragging an orange dot and see how the angle â  ABC behaves.