it has to be made out of strait lines so no curves
and it has to be closed
last it has to be flat it cant be 3D
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Either. A 5-sided polygon can be either regular or irregular. It is only regular if all sides and all angles are equal. Otherwise it is irregular. The number of sides is insufficient to determine whether a polygon is regular or irregular.
The area of a polygon is not enough to determine its shape - unless it is a regular polygon. There is nothing in the question to suggest that the octagon is regular.
More information is required in order to answer this question. What is the shape for which the perimeter is given? If it anything other than a circle or regular polygon it is not possible to determine the area. For a circle or regular polygon, the answer will depend on the shape.
A 6 sided hexagon polygon can be regular or irregular.
It is not possible to determine the length of the sides of a regular polygon simply from the number of sides.