It depends on the type of regular polygon
Triangle: 3
Quadrilateral (square) : 4
Pentagon: 5
Hexagon: 6
Heptagon: 7
Nonagon: 9
Decagon: 10
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A regular 24 sided polygon has 24 lines of symmetry.
It will have 22 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.
Well, honey, a regular polygon with 20 sides has 20 lines of symmetry. Each line of symmetry divides the polygon into two equal halves, like splitting a cake. So, if you're looking for balance in your life, just remember that 20 is the magic number for this polygon.
It depends on how many sides the polygon has: An octogon has 8 lines of symmetry, a pentagon has 5......