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Collinearity of a Triangle's Circumcenter, Incenter, and the Contact Triangle's Orthocenter

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Let I and O be the incenter and circumcenter of a triangle. Let H be the orthocenter of the triangle's contact triangle (the triangle formed by the points of contact of the incircle with the sides). Then I, O, and H are collinear.

Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA

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