The number of lines of symmetry of a triangle depends upon the kind of triangle it is:
A right triangle is a triangle where one angle is 90°. A right triangle is either a scalene triangle with no lines of symmetry or an isosceles triangle (where the legs are of equal length) with one line of symmetry which bisects the 90° angle.
No triangle can have exactly 2 lines of symmetry.
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An equilateral triangle has 3 lines of symmetry
3 is how many lines of symmetry a triangle has.
It has 3 lines of symmetry
In general, a triangle can have 0, 1 or 3 lines of symmetry.
That depends on what type of triangle it is because an equilateral triangle has 3 lines of symmetry whereas an isosceles triangle has only 1 line of symmetry and any other triangles have no lines of symmetry.