An acute scalene triangle has none.
An acute isosceles triangle has one and
an [acute] equilateral has three.
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3 lines * * * * * None if it is acute angled scalene One if it is acute angled isosceles and Three if it is equilateral.
That will depend 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 but a scalene triangle has no lines of symmetry.
There is only one line of symmetry in an isosceles triangle. If you draw this triangle with the "odd" side as the base and then bisect it with a vertical line, you will have that one line of symmetry. The triangle can be folded in half along this line because each side is a mirror of the other.
there is l line 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.