## Geometry Final Ch. 12

##### Created by:

rob_lowman  on May 30, 2012

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# Geometry Final Ch. 12

 isometrytransformation that does not change the shape or size of a figure (reflection, translation, rotation)
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#### Definitions

isometry transformation that does not change the shape or size of a figure (reflection, translation, rotation)
image reflected figure
preimage original figure
(x, y)→(x, -y) reflection across the x-axis
(x, y)→(-x, y) reflection across the y-axis
(x, y)→(y, x) reflection across the line y = x
translation transformation where all the points of a figure are moved the same distance in the same direction
rotation transformation that turns a figure around a fixed point, called the center of rotation
dilation transformation that changes the size of a figure but not the shape
tessellation a repeating pattern that completely covers a plane with no gaps or overlaps
regular a ___ tessellation is formed by congruent regular polygons
semiregular a ___ tessellations formed by two or more different regular polygons with the same number of each polygon occurring in the same order at every vertex

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