Cyclic-quad-arcs

Please install Java (version 1.4 or later) to use JavaSketchpad applets.
Cyclic Quadrilateral Arcs Theorem

For a further hint go to A Further Hint

NOTE: Due to the way the way the sketch was constructed & how some constructions are defined in the program, the above sketch might suddenly show the two lines parallel when the cyclic quadrilateral is dragged until it becomes "crossed". Have a look at the sketch below that doesn't show this "discontinuity".(Drag A, B, C or D).

Please install Java (version 1.4 or later) to use JavaSketchpad applets. Cyclic Quadrilateral Arcs Theorem

Please enable Java for an interactive construction (with Cinderella).

Please install Java (version 1.4 or later) to use JavaSketchpad applets.
Cyclic Quadrilateral Arcs Theorem