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Parallel lines Perpendicular Lines Point Pre-image Ray Reflection Reflection Line (or line of reflection): Rotation Transformation Translation Vertex Two lines are parallel if they lie in the same plane and do not intersect. indicates that line AB is parallel to line CD. Two lines are perpendicular if they intersect to form right angles. indicates that line AB is perpendicular to line CD. One of the basic undefined terms of geometry that represents a location. A dot is used to symbolize it and it is thought of as having no length, width or thickness. A figure before a transformation has taken place. A part of a line that begins at a point and continues forever in one direction. indicates a ray that begins at point A and continues in the direction of point B indefinitely. A transformation of a figure that creates a mirror image, âflips,â over a line. A line that acts as a mirror so that corresponding points are the same distance from the mirror. A transformation that turns a figure about a fixed point through a given angle and a given direction, such as 90 clockwise. The mapping, or movement, of all points of a figure in a plane according to a common operation, such as translation, reflection or rotation. A transformation that slides each point of a figure the same distance in the same direction. The location at which two lines, line segments or rays intersect.

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