Fitting a curve to three points

I recently had a need to fit a curve to three points. The geometry can get somewhat complex due to the limits of finite math, however, here is JAVA applet I’ve created with a relatively simple solution to the problem. The circle can be found using only basic math calculations and a single square root.

Drag the green points around to see how the curve fits different sets of points.

Source Code: (View) (Download)

Tower of Hanoi Animation

I recently made this animation in about a half an hour using the powerful 3D modeler Blender. This is demonstrating a solution to the Tower of Hanoi with the least possible number of moves when using 4 disks.