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Nagel's Theorem


	Let ABC be a triangle with two altitudes AA' and BB', and let O be the center of the circumcircle. Then A'B' and CO are perpendicular.


	Contributed by: Jay Warendorff After work by: Alexander Bogomolny

A. Bogomolny, "Nagel's Theorem," Interactive Mathematics Miscellany and Puzzles.

Contributed by: Jay Warendorff

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