Depends on the orientation of the triangle.
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The Isosceles triangle only has one possible line of symmetry; and that is through the vortex, AKA: The middle, in a vertical line.
Three parallel vertical lines. A bit like triangle ABC | triangle DEF, except that the lines are closer together.
There are no parallel lines in a triangle !
An equilateral triangle has 3 lines of symmetry
An equilateral triangle has three lines of symmetry.