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An infinite number are possible.
It is possible to divide a hexagon into 4 or more - up to infinitely many - triangles.
A polyhedron with two congruent triangles. There are very many possible configurations.
You have to specifically give the problem with the dots, but it can form all equilateral triangles.. .. . .. . . .
A triangle has 6 parts ... 3 sides and 3 angles. It's possible for two triangles to have as many as 3 of their parts congruent, and the triangles still not be congruent.