2 actually
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10 lines. Regular polygon of "x" sides has "x" Lines of Symmetry
4 Lines of symmetry
2 lines OF SYMMETRY
There is no such thing as 8 lines of symmetry. A circle, for example, has infinitely many lines of symmetry.
x= 5y+10 * * * * * That looks like a mistaken merge! A regular polygon with n sides has n lines of symmetry.