Triangle knowing two sidelines rb, rc and the Gergonne point Ge
1) The vertex A is the intersection
between rb and rc
2) Inscribe a circle in the quadrant
formed by rb and rc and containing Ge.
3) This circle cuts AGe at T
4) The tangent at T to the circle
cuts rb, rc at B', C'
5) Let Ge' be the Gergonne point
of AB'C'
6) The requested triangle is the
homothetic of AB'C' with center A and ratio AGe/AGe'
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