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Properties of Isometries
Chapter 12
6
Mathematics
10th Grade
04/03/2014
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Term
90 rotation counterclockwise about the origin
 Definition
(x, y) -> (-y, x)
Term
180 rotation counterclockwise about the origin
 Definition
(x, y) -> (-x, -y)
Term
Reflection across the line y=x
 Definition
(x, y) -> (y, x)
Term
Reflection across the y-axis
 Definition
(x, y) -> (-x, y)
Term
Reflection across the x-axis
 Definition
(x, y) -> (x, -y)
Term
Isometry
 Definition
A mapping for which the original figure, the preimage, and its image are congruent.
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