Decagons have 10 lines of symmetry i dont know where
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A regular decagon has rotational symmetry = 10.For irregular decagons, it could be less (either 2 or none.)
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.
a cylinder has 29 lines of symmetry!