A triangle need not have any symmetry.
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Equilateral triangles have rotational symmetry.
An isosceles triangle has two equal sides and one line of symmetry
An isosceles triangle
Equilateral triangles.
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 and other triangles have no lines of symmetry.