Rotation about a Point in the Plane

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In this Demonstration you can rotate a square, a triangle, or the letter L about the point in the plane, choosing the coordinates with the "translation by " sliders or by dragging the point in the graphic. Change the angle to see the rotation about the point . The matrix of the rotation is given by the product of three operations (from right to left): translation by , rotation around the origin, and translation back by .

Contributed by: Ana Moura Santos, Pedro A. Santos, and João Pedro Pargana (January 2011)
(Instituto Superior Técnico)
Open content licensed under CC BY-NC-SA


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