Go Geometry Problem Problem 1313: Regular Decagon, Pentadecagon, Equilateral Triangle, Congruence

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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.
 

Geometry Problem 1313: Regular Decagon, Pentadecagon, Equilateral Triangle, Congruence

See also:
Decagon.


 

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