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# Module 2 Vocabulary

TermDefinition
Transformation A change in the position, size, or shape of a figure or graph
Congruent Having the same size and shape
Rotation a transformation about a point P, such that each point and its image are the same distance from P
Center Of Rotation the point about which a figure is rotated
Symmetry In the transformation of a figure such that the image coincides with the preimage, the image and preimage have symmetry
Preimage the original figure in a transformation
Image the new position of a figure after a transformation
Rigid Motion A transformation that does not change the size or shape of a figure.
Translation a transformation that shifts or slides every point of a figure or graph the same distance in the same direction
Vector A quantity that has magnitude and direction
Initial Point the starting point of a vector
Line Symmetry a figure that can be reflected across a line so that the image coincides with the preimage
Line Of Symmetry a line that divides a plane figure into two congruent reflected halves
Rotational Symmetry when a figure can be rotated about a point by an angle less than 360 degrees so that the image coincides with the preimage
Angle Of Rotational Symmetry the smallest angle through which a figure with rotational symmetry can be rotated to coincide with itself
Terminal Point the ending point of a vector
Angle Of Rotation An angle formed by a rotating ray, called the terminal side, and a stationary reference ray, called the initial side.
Reflection A transformation across a line, called the line of reflection, such that the line of reflection is the perpendicular bisector of each segment joining each point and its image.
Perpendicular Lines Lines that intersect to form right angles
Perpendicular Bisector a line perpendicular to a segment at the segment's midpoint
Created by: Kaniyah_J
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