A square is a polygon because it is a closed geometric figure with line segments and no curved edges
Yes, a square is an equilateral polygon
Yes
A 1980 sided polygon makes 1980 vertices.
A regular polygon
it seems to me that the only polygon of your description is a square
Yes, a square is an equilateral polygon
A square polygon by definition has one face and it is square.
A square cannot be irregular though it is a polygon.
Yes
a polygon makes itself with 3 line segments if its less than three its not a polygon.Its also haves to be an closed figure....
Yes every square is a regular polygon.
Any shape with 3 or more sides is a polygon and so a square is a polygon because it has 4 sides.
a square
A 1980 sided polygon makes 1980 vertices.
Yes, a square is a regular polygon because all of its sides are equal.
A regular polygon
it seems to me that the only polygon of your description is a square