It need not have any.
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How many parallel sides has a trapezium?
0 Parallel sides
It Has 2 Pair of Parallel Sides
It has three parallel sides. ;)
Well, honey, a shape with 20 sides is called an icosagon. It's like a polygon on steroids, with all those sides flaunting their angles like they're on a runway. So next time you need to impress someone with your geometry knowledge, just drop the word "icosagon" and watch them swoon.