Can you describe the phenomena dynamically being illustrated in the applet below? How would you describe? How could you prove these true?
For more information, see this [url=https://twitter.com/gogeometry/status/858652596646662144]tweet[/url] from [url=https://twitter.com/gogeometry]Antonio Gutierrez[/url]. [br](A zoomed-in view of this tweet can be found [url=http://www.gogeometry.com/problem/p039_triangle_incenter_tangent.htm]here[/url].)