Given a triangle ABC (see the dynamic figure
below) with the inside
equilateral triangles A2BC, B2AC, and C2AB, then the lines AA2, BB2, and
CC2 are concurrent at a point F2, called the Second Fermat point.
also the static diagram of
the Second Fermat point
Dynamic Geometry Environment (DGE) or Interactive Geometry Software
(IGS) of the Second Fermat
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