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Mathematics 24 Online
OpenStudy (anonymous):

Rotate 90 degrees counterclockwise and write the new coordinates (2,-1) (4,-4) (1,-4)

OpenStudy (shadowlegendx):

Ok o-o

OpenStudy (ranga):

If the point (A, B) is rotated 90 degrees counterclockwise about the origin it will become (-B, A).

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