Dan+Harrington's+Scratch+for+Gold

THe Scratch Project I like is Elliptical Billiards... What is particularly interesting about this is that the ball continues to move with internal reflections about the two FOCI of the Ellipse. There are many mathematical insights that can be talked about when viewing this project.

[|Scratch Ellipse Project]

The next Geometry Project I looked at was the Morphing CIrcle. CHanging the pen size really gives perspective to the circle. It becomes an ellipse, a line and a circle just by moving

Morphing Circle

Discovering the Unit Circle is a class room lecture in and of itself. SLowly goes over the Unit CIrcle....really useful

Unit Circle