a polygon with 4 right angles and 4 sides of the same length
A four-sided polygon with all sides congruent and with four right angles is a square.
A rhombus.
rhombus
polygon
A rectangle is a quadrilateral with opposite sides parallel and congruent and four right angles. If all four sides are congruent, it is a square.
A rectangle is a quadrilateral with opposite sides parallel and congruent and four right angles. If all four sides are congruent, it is a square.
a rhombus
It could be an irregular polygon with 5 or more sides or a rectangle or square.
Providing it has no right angles then it is a scalene triangle.
A square. right angles are 90 degrees and in order to have a square you must have 360 degrees worth of angles. 90x4 is 360 and congruent sides means that they are all the same.
A square or a rectangle