In a rotation, the center of rotation is the point that does not move. The rest of the plane rotates around this fixed point.
A coordinate point is the description of a location on the coordinate plane. Coordinate points are commonly written in the form (x, y) where x is the horizontal distance from the origin, and y is the vertical distance from the origin.
The image is the final appearance of a figure after a transformation operation.
The pre-image is the original appearance of a figure in a transformation operation.
Reflections are transformations that result in a "mirror image" of a parent function. They are caused by differing signs between parent and child functions.
A transformation moves a figure in some way on the coordinate plane.
A translation is a transformation that slides a figure on the coordinate plane without changing its shape, size, or orientation.
Learn to recognize translation transformations, or slides.