em its a lot of shapes combined together
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It is a concave or reentrant polygon.
No. A quadrilateral is any four-sided figure. A trapezoid is one example of a quadrilateral.
Yes, such a quadrilateral can exist.
A quadrilateral is a polygon with four sides. A parallelogram is a quadrilateral in which the opposite sides are parallel.
A parallelogram must have 4 sides and so it must be a quadrilateral. However, the sides of a quadrilateral need not be parallel so a quadrilateral need not be a parallelogram.