It has 1 line of symmetry
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If it is an equilateral triangle then it has 3 lines of symmetry. If it is an isosceles triangle then it has 1 line of symmetry
A triangle has 3 sides and if two sides are equal then it's an isosceles triangle with one line if symmetry but if all sides are equal then it's an equilateral with three lines of symmetry.
An isosceles triangle has rotational symmetry of order 1.
An isosceles triangle has 3 sides and 2 of its sides are equal in lengths