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.
An equilateral has all of it's sides as the same length. You would need to know one side length to figure them all out.