depends.
If it is a right iscoceles, then it has only one.
if it is a right equilateral, it will have three.
If it is a right scalene, it will have none.
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a equilatral triangle has at least up to 4 lines of symetry
It depends on the dimensions of the triangle, some have 0, but no triangle will ever have more than 3 lines of symmetry.
2 lines of Symetry
A regular octogan has 8 lines of symetry, and a irregular octogan has 2 lines of symetry.