A square or a rhombus
A four sided polygon with four congruent sides is a rhombusA square.
A polygon.
A square is a four-sided polygon with two congruent parallel sides.
A four-sided polygon with opposite sides parallel and all sides congruent is a square.
A four-sided polygon with all sides congruent and with four right angles is a square.
a regular polygon
A four-sided polygon with four congruent sides and four equal angles is a square
A kite is a four-sided polygon with two pairs of congruent adjacent sides.
No. You also need all of the sides to be congruent. For example, a rectangle has four congruent angles, but it is not a regular polygon.
A rhombus is a quadrilateral with four equal sides
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.