Angle: formed by two lines or rays that share a common point, , , Vertex: the common endpoint of two or more rays or lines, , Degree: a unit of measure of angles, , Right Angle: an angle that forms a square corner, 90 degrees, , Obtuse Angle: an angle that measures more than 90 degrees, , Acute Angle: an angle that measures less than 90 degrees, , Straight Angle: an angle that forms a straight line, 180 degrees, , Protractor: a tool used to measure and draw angles, ,

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