Draw the line of reflection. From a point on the shape, count how far it is vertically from the line of reflection. Count the same amount horizontally on the other side of the line and plot the point.

Materials were written for an entire year's course in geometry in which transformations were used to develop the concepts of congruence, similarity, and symmetry, as well as being a vehicle for proof.

Figure 1: Experimental geometry and microscopy of screen and test pattern. To determine an effective working limit for the distance separating the sample and the exit screen we performed numerical ...