It has 3
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an equilateral triangle has all equal sides
An equilateral triangle has 3 lines of symmetry
3 because equilateral triangles are triangles that have 3 congruent sides.
If it's an equilateral triangle then its 3 sides are congruent but if it's an isosceles triangle then only 2 of its sides are congruent
any triangle has 3 sides.