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Trigonometry
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OpenStudy (anonymous):
Suppose you rotate triangle ABC counterclockwise 90º. If ABC has vertices A (-2, 1), B (-1, 4), and C (2, 2), vertex B' is ( ? , -1).
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OpenStudy (perl):
|dw:1418533016833:dw|
OpenStudy (perl):
we can use something called a rotation matrix
OpenStudy (perl):
|dw:1418533307514:dw|
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