An equilateral triangle
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It depends on the dimensions of the triangle, some have 0, but no triangle will ever have more than 3 lines of symmetry.
3, one coming from each vortex (corner) going to the opposite side of the vortex
It depends on what kind of triangle. A scalene triangle (no equal sides or angles) would not have any lines of symmetry. An isosceles triangle would have 1 line of symmetry, and an equilateral triangle would have 3 lines of symmetry.
An equilateral triangle has 3 lines of symmetry
No it's not possible. The triangle with the most lines of symmetry is Isosceles triangle and that has 3 lines of symmetry. Unless you draw on the back, but that isn't correct.