they have 4 sides
not all congruent
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It would be a concave quadrilateral The link below has some pics.
It is a 4 sided quadrilateral with a pair of opposite parallel sides of different lengths and its 4 interior angles add up to 360 degrees
A trapezoid is known in the developed world as a trapezium. It is a quadrilateral which has one pair of parallel sides and another pair which is not parallel. There are many other attributes which can be derived from these.
It is a 4 equal sided quadrilateral It has 2 equal opposite acute and 2 equal opposite obtuse angle Its opposite sides are parallel
For the same reason that a cat is an animal but an animal is not always a cat. Because a trapezoid is a special kind of quadrilateral. A quadrilateral is anything with four sides. A trapezoid has four sides, and also two of them are parallel to each other. Therefore some quadrilaterals are trapezoids, but most of them aren't.