there is 1 line of simmetry
An equilateral triangle has three. An acute isosceles has one and an acute scalene has none.
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An isosceles triangle has 1 line of symmetry, an equilateral triangle has 3 and a scalene triangle has no lines of symmetry.
A regular triangle (aka equilateral triangle) has three lines of symmetry - these are its medians, In general, a regular n-gon has n lines of symmetry.
There are no parallel lines in a triangle.
A scalene triangle
A triangle can have 0, 1 or 3 lines of symmetry.