Select a point by either entering it into the input box or by clicking and dragging point J. Explore what happens when you reflect this point across some of the lines below using the check boxes. Try changing the location of the point and see what happens to its reflection.
Do you notice any patterns? Can we think of these reflections as functions? Try reflecting a polygon by using the check boxes. You may have to move some of the text boxes around to better see your figure.