Fagnano's Problem
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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 (March 2011)
Open content licensed under CC BY-NC-SA
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"Fagnano's Problem"
http://demonstrations.wolfram.com/FagnanosProblem/
Wolfram Demonstrations Project
Published: March 7 2011