Here are some new MathCAD files written by myself.

bulletHow to plot a surface?
bulletHow to make a projectile to hit the target?
bulletUse a plane to intersect a surface (lecture notes)
bulletDraw two spheres and a cone (lecture notes)
bulletLecture notes on 2/2/2005
bulletLecture notes on 2/14/2005
bulletLecture notes on 2/23/2005