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What quadrilaterals have opposite sides that are congruent and parallel?
They all do. That is part of being a quadrilateral.
Are all quadrilaterals also parrelograms?
Quadrilaterals are called parallelograms ONLY if both pairs of opposite sides are equal and parallel to each other.
Why is a quadrilateral sometimes a parallelogram?
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.
What quadrilaterals have all sides 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.
What quadrilaterals have only one pair of parallel sides?
Trapezoids. All other quadrilaterals either have two pairs of parallel sides or none.
