Vocab: Basic Transformations

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Transformation
Operation that changes or alters the form of a figure
Dilation
A transformation in which a figure grows larger or smaller
Reflection
A transformation in which a geometric figure creates a mirror image
Rotation
A transformation in which a figure turns around a fixed center point
Translation
A transformation in which each point of a figure moves the same direction and distance
Image
The result of a transformation
Pre-image
The original figure prior to a transformation
Congruent
Exactly equal in size and shape
Similar
Having the same shape but not necessarily the same size.
Symmetry
One half of a figure is a mirror image of the other half
Center of Dilation
A fixed point in the plane in which all points are enlarged or shrunk from
Line of reflection
A line that is reflected over in a reflection
Quadrant I
Upper right section of coordinate plane (+,+)
Quadrant II
Upper left section of coordinate plane (-,+)
Quadrant III
Lower left section of coordinate plane (-,-)
Quadrant IV
Lower right section of coordinate plane (+,-)
x-axis
Axis that runs horizontally on coordinate plane
y-axis
Axis that runs vertically on coordinate plane
Line: x = 2
Line in which all x-values equal 2, resulting in a vertical line
Line: y = 2
Line in which all y-values equal 2, resulting in a horizontal line
Scale Factor
A number that multiplies some quantity - represented by a c or k
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