GoGeometry Action 102 !

Creation of this applet was inspired by a [url=https://twitter.com/gogeometry/status/915801262809059328]tweet[/url] from [url=https://twitter.com/gogeometry]Antonio Gutierrez[/url] (GoGeometry). [br][br]You can adjust the sizes of the 3 squares by dragging the LARGE WHITE POINT. [br][br][b][color=#666666]What is the measure of the GRAY ANGLE? [/color][/b][br][b][color=#ff00ff]What is the measure of the PINK ANGLE? [/color][/b][br][br][color=#0000ff][b]How can we formally prove your answers to both these questions true? [/b][/color]

Information: GoGeometry Action 102 !