# An Altitude and Four Concyclic Points

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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 (March 2011)

Open content licensed under CC BY-NC-SA

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"An Altitude and Four Concyclic Points"

http://demonstrations.wolfram.com/AnAltitudeAndFourConcyclicPoints/

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Published: March 7 2011