Rotations. A rotation. turns all points of a figure around a point called the center of rotation the angle of rotation tells us the number of degrees through which points rotate around the center of rotation. Properties of rotations.
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A rotation is a transformation about a point P such that
rotation of 90°:(x,y) (-y,x)
rotation of 180°:(x,y) (-x,-y)
rotation of 270°:(x,y) (y,-x)
A positive angle of rotation turns the figure counterclockwise,
and a negative angle of rotation turns the figure in a clockwise direction.
Unless stated otherwise, rotations are counterclockwise.