How would you put the phenomena you see below into words? Describe. [b][color=#ff00ff]How can you formally prove the measure of the pink angle IS what it IS? [/color][/b]
For more information, see this [url=http://www.gogeometry.com/education/p455_rhombus_inscribed_circle_angle_45_degrees.htm]post[/url] from Antonio Gutierrez ([url=http://www.gogeometry.com/]GoGeometry[/url]).