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Bisection of Segments by the Sides of a Triangle

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Let ABC be a triangle with orthocenter H, and let the feet of the altitudes be A', B' and C'. Let the extensions of the altitudes intersect the circumcircle a second time at A'', B'', and C''. Then HA' = A' A'', HB' = B' B'', and HC' = C' C''.

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

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See Theorem 178 in N. Altshiller-Court, College Geometry, 2nd ed., Mineola, NY: Dover, 2007 p. 95.

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