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.
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A four-sided polygon with all sides congruent and with four right angles is a square.
A rhombus.
Regular polygons have congruent sides and angles
a regular polygon
Not necessarily. A convex heptagon is a polygon but it need not have all sides and angles congruent.