opposite sides of a parallelogram are equal.
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A parallelogram, or variants of polygons with 6 or more sides.
Parallelogram ANS2: Rectangles and squares have two pairs of equal sides. The sides of a square are all equal. Parallelograms have two pairs of equal sides, the rhombus being a special case where all sides are equal. The rhombus is also described as a 'crushed square'. 'Parallelogram' includes the rectangle, square and rhombus. You also have to look at 'kites' and concave quadrilaterals that could be described as folded kites and bowties.
A parallelogram has two pairs of opposite sides that are equal in length and parallel. A rectangle has two pairs of opposite sides that are equal in length and are parallel. Thus all rectangles are parallelograms. (A rectangle has the extra condition that all its angles are equal at 90°, thus all parallelograms are not rectangles.) There cannot be a rectangle that is not a parallelogram.
Parallelogram
If a quadrilateral has two pairs of opposite congruent sides, then the quadrilateral is a parallelogram.