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The figure below shows a regular decagon ABCD... of center O and a regular pentadecagon MBCN... of center Q. Prove that (1) the triangle ABM is equilateral; (2) ON = QN.

See also: Decagon.

Home | Geometry | Problems | All Problems | Open Problems | Visual Index | 1311-1320 | Triangle | Circle | Decagon | Equilateral Triangle | Congruence | View or Post a solution | by Antonio Gutierrez