Some types of quadrilaterals don't have parallel sides. Such as a diamond or a kite.
Quadrilaterals usually have special names only if they DO have parallel sides, or some other special property. You might just call it "quadrilateral", or "a quadrilateral with no parallel sides".
No, a triangle will never have parallel sides.
They are quadrilaterals which have two pairs of parallel sides.
Quadrilaterals are two-dimensional shapes that have four sides. Quadrilaterals that have only one set of parallel sides are called trapezoids.
A trapezoid has one pair of parallel sides. All other quadrilaterals have no parallel sides or two pairs of parallel sides.
Quadrilaterals like Parallelogram(Square,rectangle), Rhombus have oppsite sides parallel to each other.
Sometimes, but not necessarily.
Trapezoids. All other quadrilaterals either have two pairs of parallel sides or none.
The four quadrilaterals that are symmetrical and have two pairs of parallel sides are:SquareRectangleRhombusParallelogram
There are quadrilaterals that have no parallel sides. (basically, a quadrilateral is just any enclosed shape with 4 sides) But all quadrilaterals have angles.