## Reflections- Chapter 9

##### Created by:

jarren11  on March 8, 2011

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# Reflections- Chapter 9

 Angle of Rotationangle formed by rays drawn from the center of rotation to a point and its image
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#### Definitions

Angle of Rotation angle formed by rays drawn from the center of rotation to a point and its image
Center of Rotation the fixed point
Column Matrix A matrix containing one column often used to represent an ordered pair or a vector, such as <x,y> = [x (over) y]
Component form written form of a vector that combines the horizontal and vertical components <5,3>
Composition a transformation made up of successive transformations
Dilation A transformation that changes the size of an object, but not the shape.
Direct isometry is one in which the image of a figure is found by moving the figure intact within the plane
Direction the measure of the angle that a vector forms with the positive x-axis or any other horizontal line
Equal vectors vectors that have the same magnitude and direction
Glide reflection a composition of a translation and reflection in a line parallel to teh direction of the translation
Indirect isometry an isometry that cannot be performed by maintaing the orientation of the points, as in a direct isometry
Isometry a mapping for which the original figure and its image are congruent
Line or reflection a line through a figure taht separates the figure into two mirror images
Line of symmetry a line that can be drawn through a plane figure so that the figure on one side is the reflection image of the figure on the opposite side
Magnitude the length of a vector
Parallel vectors vectors that have the same or opposite direction
Point of symmetry the common point of reflection for all points of a figure
Reflection a transformation representing a flip of the figure over a point, line, or plane

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