no, only equilateral triangles have 3 lines of symmetry
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YES!!! An equilateral triangle has three lines of symmetry. They are drawn from any one corner to the opposite base. They should all intersect at the centre of the triangle. By comparison, an Isosceles triangle has only one line of symmetry. From the one unequal angle to the opposite side. Right angled, and scalene triangles do not have lines of symmetry.
I imagine that all of them have three straight lines.
not all shapes have lines of symmetry. one example is a triangle.
All regular octagons have the same number of lines of symmetry, but octagons with unequal sides would have fewer lines of symmetry.