Creation of this applet was inspired by a [url=https://twitter.com/gogeometry/status/841148923360231424]tweet[/url] from [url=https://twitter.com/gogeometry]Antonio Gutierrez[/url]. [br][br][b][color=#0000ff]How can you formally prove what this applet informally illustrates? [/color][/b] [br][br](A big shout out and thank you to Sarah Beaulieu, who took control of the applet once I was finished and picked out different colors for the objects.)