By A Mystery Man Writer
Geo Rotating 90 degrees about the origin by Daniel Ramirez - October 23, 2011
3 Ways to Rotate a Shape - Lindsay Bowden
Lesson Explainer: Rotations on the Coordinate Plane
ShowMe - origin
Rotation 90 degrees counterclockwise – GeoGebra
Rotations - Geometry Abroad
How to Rotate a Figure about the Origin, Geometry
rotations about the origin
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ShowMe - degrees