The first image shown here was initially created in Geogebra, and then saved as an animated gif, and edited a bit for size on screen (and to keep file size down.) The second is an embedding of the actual Geogebra file (available here)
My main point in creating it was twofold: 1) another example of how dynamic geometry can be used with students at younger and younger ages, and 2) a bit of practice for me in using a single slider as a time line for an animation.
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