Creation of this resource was inspired by a [url=https://twitter.com/solvemymaths/status/1084058408913985536?s=20]problem[/url] posed by [url=https://twitter.com/solvemymaths]Ed Southall (SolveMyMaths)[/url]. [br][br]All polygons shown here are regular. [br]The [b][color=#1e84cc]2 LARGE BLUE POINTS[/color][/b] are [color=#1e84cc][b]MOVEABLE[/b][/color]. [br][br][br][b]Key Questions:[/b][br][br]1) What is the measure of the [b][color=#ff00ff]pink angle[/color][/b]? [br]2) How can we formally prove what is dynamically illustrated here?