Creation of this applet was inspired by a [url=https://twitter.com/gogeometry/status/852994378255749120]tweet[/url] from [url=https://twitter.com/gogeometry]Antonio Gutierrez[/url]. [br]Feel free to move any [b]BIG POINTS [/b]anywhere you'd like at any time. [b][br][color=#0000ff][br]How can you formally prove what this applet informally illustrates? [/color][br][/b]