Note to Students and Teachers:
The applet linked to on the left is a minor modification of one produced by the JCM project at Hobart and William Smith Colleges. The only difference is that  I have  chosen to color the line segments so as to match the colors used for equal lengths.
The one on the right demonstrates a geometric construction of points on the composite function graph. There are several versions of this on the web.

Note to Developers: The applets linked to above were built in 2001-4 with the GeX component library.  and their development was influenced by a visit with the ESCOT team in the summer of 2000.