[color=#ff0000][b]Definition:[/b][/color][br][br]A [color=#0000ff][b]cyclic quadrilateral[/b][/color], by definition, is [color=#0000ff]any quadrilateral that can be inscribed inside a circle.  That is, all 4 vertices of a cyclic quadrilateral always lie on the circle itself. [/color] [br][br]Mess around with the applet for a couple of minutes, and then answer the questions that follow.  [br]

Q1: What can you say about opposite angles in a cyclic quadrilateral?[br][br]

Q2: What can you say about the sum of the interior angles of a cyclic quadrilateral? (i.e. the sum of the red, green, blue and orange angles)