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The Circumcircle of the Orthocenter and Two Vertices and a Parallelogram
Let ABC be a triangle. Let the perpendicular from the orthocenter H to the altitude HC intersect the circumcircle of HBC at P. Then ABPH is a parallelogram.
Contributed by:
Jay Warendorff
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Circumcircle
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Wolfram
MathWorld
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Orthocenter
(
Wolfram
MathWorld
)
Parallelogram
(
Wolfram
MathWorld
)
Perpendicular
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Wolfram
MathWorld
)
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The Circumcircle of the Orthocenter and Two Vertices and a Parallelogram
" from
the Wolfram Demonstrations Project
http://demonstrations.wolfram.com/TheCircumcircleOfTheOrthocenterAndTwoVerticesAndAParallelogr/
Contributed by:
Jay Warendorff
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