A number of interactive web pages have been, or will be, created for Math 444 with Java Sketchpad. Each of these pages is linked from one of the Week pages to which it is related, but in addition, they are all collected togetter on this page.
Why SSA (Side-Side-Angle) is not a Congruence Criterion
Some Special Lines, Rays and Segments of a Triangle
Trapezoid Ratio interactive page
and a second
Trapezoid Ratio Interactive Page with Answers to Worksheet
Intersecting chord and secant theorems