A quadrilateral with only one pair of parallel lines is called a trapezoid.
square
A paralellogram
Parallelogram
A parallelogram.
An irregular quadrilateral can have zero, one, or two pairs of parallel lines, but typically it has no parallel lines. By definition, an irregular quadrilateral does not have equal sides or angles, which means it does not conform to the properties of specific types of quadrilaterals like rectangles or parallelograms that have parallel sides. Thus, the most common scenario for an irregular quadrilateral is having no parallel lines at all.
A trapezium is a quadrilateral with two parallel lines.
A trapezoid is a quadrilateral with exactly two parallel sides.
It is a trapezoid
There are two definitions for trapezoids. One defines them as a quadrilateral with at least two parallel lines, which would include parallelograms. The other strictly defines trapezoids as quadrilaterals with exactly two parallel lines.
Most of the time.If a quadrilateral contains no parallel lines or two pairs of parallel lines then it is not a trapezium.
trapezoid
squarerectangleparallelogram
A parallelogram
square
Not if the two pairs give rise to 4 parallel lines.
A four-sided quadrilateral having two lines of symmetry is a rectangle
A paralellogram