Creation of this resource was inspired by [url=https://twitter.com/gogeometry/status/1131985608610656262?s=20]this tweet[/url] posted by [url=https://twitter.com/gogeometry]Antonio Gutierrez[/url] (GoGeometry). [br][br]The 2 smaller circles are each tangent to the large circle and to the radii of the large circle they touch. [br]You can move any of the [b]LARGE POINTS[/b] anywhere you'd like [b]AT ANY TIME[/b]. [br][b][color=#0000ff][br]How can we formally prove the phenomenon dynamically illustrated here? [/color][/b]