How to Rotate a shape about the origin 90° counter-clockwise « Math :: WonderHowTo
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Linear Transformations
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Wikipedia:Reference desk/Archives/Mathematics/June 2006 - Wikipedia
How to Rotate a Figure about the Origin, Geometry
Rotating shapes about the origin by multiples of 90° (article)
Transformations - Rotate 90 Degrees Around The Origin
How to Rotate a shape about the origin 90° counter-clockwise « Math :: WonderHowTo
90 Degree Clockwise Rotation Rotation of Point through 90° about the Origin
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Linear Transformations
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