Creation of this applet was inspired by a [url=https://twitter.com/gogeometry/status/958327507517833217]tweet[/url] posted by [url=https://twitter.com/gogeometry]Antonio Gutierrez[/url] (GoGeometry). [br][br]You can move the [b]LARGE WHITE VERTICES[/b] of the [b][color=#bf9000]RIGHT TRIANGLE[/color][/b] anywhere you'd like at any time. [br][color=#0000ff][b][br]How can we formally prove the phenomenon dynamically illustrated here?[/b][/color]