There is no such word as a dectagon. And since it could refer to an octagon or a decagon (or possibly something else), it is not possible to give a sensible answer. Please correct your spelling and resubmit the question. If the question refers to either an octagon or a decagon, they can be regular but need not be.
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it is regular
Dectagon
regular shape is a shape that has same sides irregular shape is a shape that has diffrent sides
A decagon has 10 sides if that is what you meant
A kite is only a regular shape if it is also a square or rectangle.