A pentagon.
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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
It is called a regular polygon.
A regular polygon is one in which all the sides are the same length and also, all the angles are of the same measure. A rhombus, is a four sided polygon (quadrilateral) in which all sides are of equal length. However, in general, it is not regular because the angles are not the same - unless it forms a square.