The second Fermat point or (also known as the second isogonic center) can be constructed
by drawing equilateral triangles on the inside
of a given non-equilateral triangle and connecting
opposite vertices. The three green connecting lines
in the figure, extended as necessary, intersect
in the second Fermat point, which has triangle
center function
or 
(also known as the second isogonic center) can be constructed
by drawing equilateral triangles on the inside
of a given non-equilateral triangle and connecting
opposite vertices. The three green connecting lines
in the figure, extended as necessary, intersect
in the second Fermat point, which has triangle
center function
(Kimberling 1998, p. 68).
