## Geometry Chapter 7- Vocabulary for 2/10/12

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Geometry Vocabulary for quiz 2/10/12

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# Geometry Chapter 7- Vocabulary for 2/10/12

 (X, -Y)If (x,y) is reflected in the x-axis, its image has coordinates (_, _)
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#### Definitions

(X, -Y) If (x,y) is reflected in the x-axis, its image has coordinates (_, _)
(-x, y) If (x,y) is reflected in the y- axis, its image has coordinates (_,_)
(y, x) If (x,y) is reflected in the line y=x, its image has coordinates (_,_).
(-y,x) Rotating (x,y) 90 degrees counterclockwise about the origin
(-x,-y) Rotating (x,y) 180 degress counterclockwise about the origin
(y,-x) Rotating (x,y) 270 counterclockwise about the origin
(x,y) Rotating (x,y) 360 counterclockwise about the origin
Glide Reflection a translation followed by a reflection where the line of reflection is parallel to the vector
Vector A quantity that has magnitude (length) and direction
Translation an isometry in which the points in the original figure move an identical distance along parallel paths to the image. All points in the preimage are equidistant from their points. A distance and a direction together define this.
Vector A translation is described by a __(Blank)___ which has magnitude and a direction.
Compositions When two of more transformations are combined to produce a single transformation. The order the transformations are performed may or may not affect the final image. The composition of two (or more) isometries remains an isometry.
Dilations A transformation of a shape in which the shape remains the same but the size changes.
Scale Factor; center of dilation A dilation requires a __(Blank)___ and a __(Blank)___
Isometry A dilation is not an __(Blank)___
Size A dilation changes the __(Blank)___of an object
Shape; Angles A dilation does not change __(Blank)___ and __(Blank)___ of an object
Positive The scale factor of a dilation must always be __(Blank)___

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