Two
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.
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.
It has 9 diagonals
It has 2 diagonals
Two
A decagon has 10 sides if that is what you meant
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.
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.
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 a dectagon is another word for a decagon then this is a 10 sided polygon. No matter how many sides it has, the sum of the external angles of a convex or regular polygon is 360°.
Not sure about "another" since there is no such thing as a dectagon. A 10 sided figure is a decagon.
Dectagon
it is regular
It has 1,345,890 diagonals
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.An octagon has 8 sides, a decagon has 10.
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. Also, is the word sieds meant to refer to sides? Please correct your spelling and resubmit the question.