A quadrilateral is any figure with 4 sides. ("quad" = 4, "latus" = side). It doesn't have to have any parallel lines. If it happens to have two sides that are parallel, then it's a trapezoid. If it happens to have two pairs of parallel sides, then it's a parallelogram.
Common parallelograms are rectangles, squares, and kites.
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No
A quadrilateral with only one pair of parallel lines is called a trapezoid.
A rectangle, by definition is an irregular quadrilateral. It has two pairs of parallel sides.
no? because in order to be a quadrilateral you need 4 sides. a pair of parallel lines in just 2 lines. parallel lines also never touch.
quadrilateral