They all do. That is part of being a quadrilateral.
Quadrilaterals are called parallelograms ONLY if both pairs of opposite sides are equal and parallel to each other.
All parallelograms are quadrilaterals, though not all quadrilaterals are parallelograms. Both have 4 sides and 4 corners. A quadrilateral can have sides and corners of different sizes, whereas a parallelogram must have opposite sides that are parallel.
It's not possible to have all sides parallel. The quadrilaterals that have every side parallel to the one opposite it ... or two pairs of parallel sides ... are: -- parallelograms -- rhombera -- rectangles -- squares Notice that -- every square is also a rectangle, a rhombus, and a parallelogram. -- every rectangle is also a parallelogram. -- every rhombus is also a parallelogram.
Trapezoids. All other quadrilaterals either have two pairs of parallel sides or none.
They are quadrilaterals; opposite sides are parallel.
Quadrilaterals that have parallel opposite sides (assuming that each side is parallel to its opposite): A parallelogram A rectangle A square (really a rectangle with all sides equal in length)
opposite sides are parallel opposite sides congruent opposite angles are equal opposite lines parallel 1 pair opp. lines parallel and congruent
They all do. That is part of being a quadrilateral.
Because they are both four sided quadrilaterals with opposite parallel sides.
All four of it's sides are parallel to the one opposite it.
Quadrilaterals are called parallelograms ONLY if both pairs of opposite sides are equal and parallel to each other.
Any that are not a parallelogram (rhombus, rectangle, square). These would include all irregular quadrilaterals as well as trapezoids (trapeziums) which have only one set of parallel sides.
A trapezoid only has one pair of opposite parallel sides of different lengths but like all other quadrilaterals it has 4 sides.
Rhombus is a quadrilateral whose all sides are equal and its opposite sides are parallel to each other but their anger are not equal to 90°.
All parallelograms are quadrilaterals, though not all quadrilaterals are parallelograms. Both have 4 sides and 4 corners. A quadrilateral can have sides and corners of different sizes, whereas a parallelogram must have opposite sides that are parallel.
A trapezoid has one pair of parallel sides. All other quadrilaterals have no parallel sides or two pairs of parallel sides.