Help with this problem. When the marked angles added, it is 120 degrees.

Last edited by pajala; March 15th 2006 at 03:44 AM.

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Equilic Quadrilateral, nice! AKMC is cyclic 'cause , then . In the other hand BMJC is also cyclic, therefore are collinear and analogous form L. Try to prove the rest, is not hard.

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