A square
An equilateral figure means that the figure has all sides that are the same length.
Any figure with 6 sides is a Hexagon. If all sides of the figure are of the same length, and all interior angles are 120° then you have a regular hexagon.
If by "the same measurement" you mean length, then you are referring to an "equilateral polygon", a flat / 2-dimensional figure whose sides are all the same length.
A rectangle.
triangle
A four sided figure with all sides the same length and opposite sides parallel.
a square :D
A regular pentagon.
Undecagon is a 11sided figure
It is a square.
A polygon is any closed figure with 3 or more sides. The sides need not all have the same length.
That's what I call a "square".