No, all parallelograms are quadrangles or quadrilaterals which have 4 sides. Hexagons have 6 sides.
No, rectangles do not have congruent sides. Squares have congruent sides.
It all depends on what kind of polygon it is. It may have no congruent sides or all congruent sides.
All regular shapes have congruent sides.
Yes! All six sides of a hexagon are congruent. It doesn't have to have all sides congruent. A hexagon only needs six sides to be a hexagon.
All sides congruent = square Two pairs of mutually congruent sides = rectangle
All sides of a square are congruent.
Corresponding sides and angles are not all congruent.
A trapezium with all its sides congruent is an impossible shape.