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The figure shows
the circumcircle of a triangle ABC with the altitudes AD, BE,
and CF. EF extended cuts arc AB at M. Lines BM and DF meet at N.
Prove that (1) AFMN is a cyclic quadrilateral; (2) AM = AN.
This entry contributed by Peter Tran.
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Cyclic Quadrilateral |
| by Antonio Gutierrez
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Last updated: May 11, 2016