Chap. 9 Vocabulary Flashcards
A combination of two or more transformations
composition of transformations
The resulting figure after a transformation
image
A dilation with a scale factor that is between 0 and 1.
reduction
Compositions of rigid motions and dilations map preimages to similar images.
similarity transformation
A transformation that preserves distance and angle measures
rigid motion
Making a figure smaller or larger so that it is similar to the original figure.
dilation
The value by which a figure is reduced/enlarged
scale factor of a dilation
Compositions of rigid motions take figures to congruent figures, so they are called…
congruence transformation
A line that a figure is reflected over
line of reflection
The original figure before the transformation
preimage
A transformation that maps all points of a figure the same distance in the same direction
translation
A dilation with a scale factor that is greater than 1
enlargement
A point that a figure is rotated about
center of rotation
A mapping that results in a change in the position, shape, or size of the figure
transformation
A point that is the center of an enlargement/reduction
center of dilation
The number of degrees a figure is rotated
angle of rotation
A transformation that preserves distance or length
isometry
The composition of a translation followed by a reflection across a line parallel to the direction of translation
glide reflection
Two figures are this term iff there is a sequence of one or more rigid motions that maps one figure onto the other.
congruent
A transformation in which the preimage and image are equidistant from the center of rotation
rotation
A transformation in which each point of the figure maps to another point the same distance from the line but on the other side.
reflection
Two figures are this…iff there is a similarity transformation that maps one figure onto the other
similar
