1) Suppose, in the applet above, the red angle measures 76 degrees. What would the measure of the blue angle be?2) Suppose, in the applet above, the pink angle measures 130 degrees. What would the measure of the green angle be?
3) From what you've observed, what is the relationship between any pair of opposite angles of a cyclic quadrilateral?
4) Note that all 4 of this cyclic quadrilateral's interior angles are inscribed angles of a circle. Explain why, using your previous work with inscribed angles, the phenomena you've observed above holds true for any cyclic quadrilateral.