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Fagnano's Problem
Let ABC be an acute triangle. Let D, E, and F be the points where the altitudes from A, B, and C intersect the sides of the triangle. Then DEF is the inscribed triangle of smallest perimeter.
Contributed by:
Jay Warendorff
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Acute Triangle
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Altitude
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MathWorld
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Fagnano's Problem
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Orthic Triangle
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PERMANENT CITATION
"
Fagnano's Problem
" from
the Wolfram Demonstrations Project
http://demonstrations.wolfram.com/FagnanosProblem/
Contributed by:
Jay Warendorff
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