heck yeah it does
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It can do, but it need not have any non-trivial rotational symmetry. A regular decagon will have rotational symmetry of order 10.
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A regular decagon has rotational symmetry = 10.For irregular decagons, it could be less (either 2 or none.)
A decagon has 10 sides, so it also has 10 angles. Each angle of a decagon is 36 degrees (360 degrees divided by 10). Therefore, a decagon has 10 angles of rotation symmetry.
A trapezium does not have rotational symmetry.
The letters H and Z have both line symmetry and rotational symmetry
It has 8lines of rotational symmetry