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To work with rotations,
you need to be able to recognize angles of certain sizes and understand
the basic workings of a unit circle.
You should be able to recognize and reproduce the
approximate size
of a right angle
(90 degrees), a
45
degree angle, a 30 degree angle
and a
60 degree angle.
The radius of a unit circle is one (one
unit).
Notice that degree movement on a unit circle goes in a counterclockwise
direction.
You will want to remember the layout of the unit circle when you are
graphing figures and their rotations.
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