Lester's Theorem
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Let ABC be a scalene triangle. Then the circumcenter O, nine-point center N, and first and second Fermat points and
are concyclic.
Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA
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"Lester's Theorem"
http://demonstrations.wolfram.com/LestersTheorem/
Wolfram Demonstrations Project
Published: March 7 2011