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A Concurrency of Lines Joining Orthocenters
Let ABC be a triangle with incenter I. Let A', B' and C' be the excenters opposite A, B, and C, respectively. Then the lines joining the orthocenters of IBC and A'BC, IAC and B'AC, and IAB and C'AB are concurrent.
Contributed by:
Jay Warendorff
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Excenters Orthocenters Concurrence and More...
RELATED LINKS
Concurrent
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Excenter
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Wolfram
MathWorld
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Excircles
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MathWorld
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Incenter
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Wolfram
MathWorld
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Incircle
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Wolfram
MathWorld
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Orthocenter
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Wolfram
MathWorld
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PERMANENT CITATION
"
A Concurrency of Lines Joining Orthocenters
" from
the Wolfram Demonstrations Project
http://demonstrations.wolfram.com/AConcurrencyOfLinesJoiningOrthocenters/
Contributed by:
Jay Warendorff
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