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an angle that measures grater than ninety degrees and less than one-hundred-eighty degrees
two angles that are in the same plane with a common vertex and a common side, but no common interior points
a segment that passes through the center of the circle and whose endpoints are on the circle
a transformation across a line. Each point and its image are exactly the same distance from the line
a transformation about a point. Each point and its image are the same distance from that point
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