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# Topic 3 Vocabulary

### Straughn High School 9th Grade Geomertry

Composition of rigid motions a transformation with two or more rigid motions in which the second rigid motion is performed on the image of the first rigid motion
Image resulting figure
Line of reflection a transformation such that if point A is on line r, then its image B is the point such that line r is the perpendicular bisector of line BB
Preimage original figure
Reflection a rigid motion that reflects each point in the preimage across a line of reflection
Transformation a change in the position, size, or shape of a geometric figure
Angle of rotation the positive number of degrees that a figure rotates
Center of rotation the point P that an image is rotated around
Rotation a rigid motion that rotates each point in the preimage about a point P by an angle measure of x degrees
Rigid Motion a transformation that preserves distance and angle measures
Translation a transformation that moves points the same distance and in the same direction
Glide reflection the composition of a reflection followed by a translation in a direction parallel to the line of reflection
Line of symmetry reflection line
Point symmetry the type of symmetry for which there is a rotation of 180 degrees that maps a figure onto itself
Rotational symmetry the type of symmetry for which there is a rotation of 360 degrees or less that maps a figure onto itself
Dilation preserves angle measures ONLY and is a copy of the pre-image that is either larger or smaller than the original. It is NOT one of the rigid motions, but it is a transformation
Symmetry a rigid motion that maps the figure onto itself
Rigid motion a transformation that preserves distance and angle measure
Created by: user-1582395
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