What relationship(s) is/are dynamically being illustrated in the applet below? How would you describe in words? How can we formally prove what you see true?
For more information, see this [url=http://www.gogeometry.com/problem/p400_triangle_angle_bisector_circumcircle.htm]post[/url] from [url=http://www.gogeometry.com/]Antonio Gutierrez[/url].