Circles through the Orthocenter
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The three circles through two vertices of a triangle and its orthocenter (the intersection of the triangle's altitudes) have the same radius as the circumcircle.
Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA
"Circles through the Orthocenter"
Wolfram Demonstrations Project
Published: March 7 2011