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An Altitude and Four Concyclic Points


	Let ABC be a triangle and let A' be the foot of the altitude from A. Let P and Q be the perpendicular projections of A' onto AB and AC, respectively. Then B, C, P, and Q are concyclic.


	Contributed by: Jay Warendorff

Altitude (Wolfram MathWorld)

Concyclic (Wolfram MathWorld)

Perpendicular (Wolfram MathWorld)

"An Altitude and Four Concyclic Points" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/AnAltitudeAndFourConcyclicPoints/

Contributed by: Jay Warendorff

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