The Fuhrmann center Fu is the center of the Fuhrmann circle, given by the midpoint of the line joining the Nagel point and orthocenter (which forms a diameter of the Fuhrmann circle). It is Kimberling center X_355 and has equivalent triangle center functions α_355 | = | a cos A - (b + c) cos(B - C) α_355 | = | (a - b + c) cos B + 2(b + c) cos B cos C α_355 | = | (2a(b + c) sec A + (-a + b + c)(b sec A + c sec C))/a.
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