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If you're referring to an equilateral triangle, a triangle in which all three sides are the same length, then there are three lines of symmetry.
An equilateral triangle has 3 lines of symmetry
there r 3 lines of symmetry in a equilateral triangle
It has 3 lines of symmetry
It depends on the type of triangle. A scalene triangle (no equal sides) has no rotational symmetry. An isosceles triangle (2 equal sides) has rotational symmetry order 2. An equilateral triangle (3 equal sides) has rotational symmetry order 3. The order of rotational symmetry is how many time a shape will fit over itself during one complete rotation.