None, because there is no such shape. The word could be a hexagon or a heptagon, or maybe you meant something else entirely. Please check and correct your spelling and resubmit.
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Both words, as well as "similarity" are incorrectly spelled: there is no such thing as a hextagon nor a petagon.
how many sides does an polygonshave
4 sides
How many parallel sides has a trapezium?
how many sides convex quadilaterals have