yes, one across.
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The Hindu-Arabic numeral of 4 does not have any lines of symmetry as such but the numeral of 0 does have lines of symmetry
No
That depends 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 any other triangles have no lines of symmetry.
Number of lines of symmetry = Number of sides of the regular polygon
A hexagon need not have any lines of symmetry. Or, it can have just one line of symmetry. A regular hexagon has six lines of symmetry, including three along the lines bisecting the angles and three along the lines formed by bisecting the sides. A regular hexagon has a rotational order of 6.