Charlie's Sketchpad files
The following are some Sketchpad files that I've used in the RUSMP that I want to make available to my colleagues. I wrote these for myself, so they're not always the most user-friendly things in the world. Hopefully they can be of some use to you. Each construction starts with a blank screen, and does not depend on any prior file or construction. Please feel free to use, tweek, improve, or whatever.
These files give you instructions on Geometer's Sketchpad constructions:
How to draw a smiley (or scary) face
How to inscribe a pentagon in a circle
How to multiply complex numbers using Sketchpad
Here are a couple of Sketchpad documents that are used as demonstrations, rather than construction exercises for the kids:
Trig waves (I like the way I did the sine, cosecant and tangent funtions here. I would do the cosine differently now.)
Polar graphs Oooh, pretty.