A square's opposite sides are parallel and all the sides are congruent.
A rhombus.
In all parallelograms, opposite angles and opposite sides are congruent. If all four sides are congruent, it's a rhombus. If all four angles are congruent, it's a rectangle. If all four sides and all four angles are congruent, it's a square.
You must be talking about a rhombus.In a rhombus, all four sides are congruent, opposite angles are congruent, and opposing sides are parallel. Rectangles, squares, and kites must be rhombi, and rhombi must be parallelograms, quadrilaterals, and polygons.
A four-sided polygon with opposite sides parallel and all sides congruent is a square.
Opposite sides are congruent in every parallelogram.Adjacent sides are congruent only if the parallelogramhappens to be a rhombus.
No, opposite sides are equal.
A square
All of them.
rectangle
rhombus
A parallelogram (and all its special cases) has two pairs of opposite sides that are congruent. An isosceles trapezium has one pair of congruent opposite sides. Selected irregular quadrilaterals can have a pair.