A quadrilateral is the term for a four sided polygon. It is the most general term. It does not imply anything about side lengths or angles being equal nor unequal.
Some other answerers have stated that a trapezium (or trapezoid, depending or where you live) fits this description, but it is possible to have two sides (the non parallel sides) to have the same length and still be a trapezoid. But you can have a trapezoid (which only needs 4 sides and 1 pair of parallel sides) that fits the description above (4 sides none of which are equal length).
A quadrilateral
regular polygon\
The right answer is a rectangle.
A regular polygon requires all sides to be the same length; in a rectangle not all four sides are the same length (they form two pairs of sides of equal length) and so it is not a regular polygon.
No. Except that in a REGULAR polygon, all the sides must be of the same length and all the angles of the same measure.
rhombus
A quadrilateral
regular polygon\
You are a rhombus.
You are a rhombus.
trapazoid
A rhombus perhaps?
An equilateral polygon is a polygon where the length of all the sides of the polygon are the same length.
The right answer is a rectangle.
A regular polygon requires all sides to be the same length; in a rectangle not all four sides are the same length (they form two pairs of sides of equal length) and so it is not a regular polygon.
No. Except that in a REGULAR polygon, all the sides must be of the same length and all the angles of the same measure.
a regular polygon