What phenomena are dynamically being illustrated in the animation below? How can we prove these phenomena true?
For more information, see this [url=http://www.gogeometry.com/school-college/4/p1313-decagon-pentadecagon-equilateral-triangle.htm]post by Antonio Gutierrez[/url] ([url=http://gogeometry.com/]GoGeometry[/url]). [br]