Any triangle that is not isosceles or equilateral.
An equilateral triangle has 3 lines of symmetry, while an isosceles triangle has only one, and any other triangle (non-isosceles right triangle, or scalene triangle) has zero.
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An equilateral triangle
An equilateral triangle has 3 lines of symmetry
It depends on how many sides that it has and whether of not it is regular (all the lines of the polygon are of equal length if it is a regular polygon). For regular polygons, the number of symmetry lines is the number of sides if number of sides is an odd number. Otherwise, the number of symmetry lines is double the number of sides. A square has 4 sides and 8 symmetry lines; a triangle has 3 sides and 3 symmetry lines.
An equilateral triangle has 3 lines of symmetry
A regular hexagon with 6 equal sides will have 3 lines of symmetry