Yes 2 ten sided regular decagons can be similar or congruent to each other
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No. Two regular hexagons are always similar to each other, but two random hexagons are not necessarily similar.
Decagons have 10 lines of symmetry i dont know where
A regular decagon has rotational symmetry = 10.For irregular decagons, it could be less (either 2 or none.)
A regular decagon will have 5 pairs of parallel sides, however, irregular decagons can have no parallel sides.
Yes