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It depends on what type of regular polygon. For example: regular triangle, regular pentagon, etc.
A regular polygon that has 180 degrees is an equilateral triangle.
If you want a triangle per each side of a regular hexagon, the answer is 6.
At least 3 sides such as a triangle which will tessellate leaving no gaps or overlaps
a regular or scalene triangle has no equal sides
A regular triangle (aka equilateral triangle) has three lines of symmetry - these are its medians, In general, a regular n-gon has n lines of symmetry.
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It depends on what type of regular polygon. For example: regular triangle, regular pentagon, etc.
A regular hexagon
A regular polygon that has 180 degrees is an equilateral triangle.
a triangle has 180 degree but each exterior has 90 degree .
If you're referring to an equilateral triangle, a triangle in which all three sides are the same length, then there are three lines of symmetry.
The angle of rotation for a regular polygon with 7 sides isImmersive Reader
Many different shapes; Square being the most obvious, Equilateral Triangle, Any Regular Polygon
A regular hexagon
If you want a triangle per each side of a regular hexagon, the answer is 6.