math definition of reflection
Reflection - of a polygon. A transformation where each point in a shape appears at an equal distance on the opposite side of a given line - the line of reflection. Try this Drag any orange dot to move the line of reflection or reshape the triangle. In this transformation, we start with a given shape.
A Reflection is a transformation in which the figure is the mirror image of the other. 1  Reflection can also be called as flip. 2  In above figure, one figure is the mirror image of the other. So, the transformation is a reflection.  A reflection is the mirror image.