Triangle given the circumcenter O, the foot Ha of the A-altitude and the foot Wa of the A-bisector
1) Draw the circle with center Wa
through Ha.
2) The tangents from O to this circle
cut the perpendicular from Ha to HaWa at the two possible positions of
A.
3) For each A, the circle with center
O through A cuts HaWa at B and C.
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