Angle, The space between two rays or lines that meet at a point., Ray, A straight line that starts at a point and continues forever in one direction., Arm (of an angle), One of the two lines or rays that form an angle., Vertex, The point where two arms of an angle meet., Degree (°), The unit used to measure the size of an angle., Acute Angle, An angle that is less than 90°., Right Angle, An angle that measures exactly 90°., Obtuse Angle, An angle that is more than 90° but less than 180°., Straight Angle, An angle that forms a straight line and measures exactly 180°., Reflex Angle, An angle greater than 180° but less than 360°., Revolution, A full turn, which measures 360°., Adjacent Angles, Angles that share a common vertex and side, and are next to each other., Complementary Angles, Two angles whose measures add up to 90°., Supplementary Angles, Two angles whose measures add up to 180°., Vertically Opposite Angles, Angles opposite each other when two lines cross; they are always equal., Angles at a Point, Angles that meet at a single point; their sum is always 360°., Parallel Lines, Lines that are always the same distance apart and never meet., Alternate Angles, Angles on opposite sides of a transversal but inside parallel lines; they are equal..

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