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Rotations
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A
rotation
is a type of
transformation
that turns a figure around a fixed point, called the
center
of
rotation
.
When
you rotate a figure, the original figure is called the
preimage
.
The rotated figure is called the
image
.
For example, the preimage below is rotated 90° counterclockwise to create the
image.
A
preimage and its rotated image are
congruent
,
which means they have the same size and shape. Because of this, rotations are considered a type of
congruence
transformation
,
or
isometry
.
When
a point is rotated, you can name the new point using the prime symbol, '. For example, the rotated image of point
B
would be point
B
'
,
read
"
B
prime."
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Rotations: graph the image
Related
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Rotations: graph the image
Rotations: find the coordinates
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Rotations: graph the image
Rotations: find the coordinates
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