transformation, a change in the position or size of a figure., preimage, the original figure in a transformation., image, a figure resulting from a transformation., translation, a slide of a figure along a horizontal and or vertical line., reflection, a figure that flips across a line., line of reflection, the line that a figure is flipped or reflected across to create a mirrored image., rotation, a figure turns around a point., center of rotation, the point that the figure is rotated around., 90 degrees clockwise rotation, (x,y)---(y,-x), 90 degrees counterclockwise rotation, (x,y)---(-y,x), 180 degrees rotation, (x,y)---(-x,-y), reflection across the y-axis, (x,y)---(-x,y), reflection across the x-axis, (x,y)---(x,-y), 270 degrees counterclockwise rotation, (x,y)---(y,-x) same as 90 degrees clockwise., 270 degrees clockwise rotation, (x,y)---(-y,x) same as 90 degrees counterclockwise., corresponding side length, matching side that is proportional., preserve orientation, translations. rotations, and dilations., preserve congruency, translations, rotations, and reflections..

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