There is no one type. Examples of quadrilaterals that are not parallelograms are trapezoids and kites.
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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.
A quadrilateral is a polygon with four sides. A parallelogram is a quadrilateral in which the opposite sides are parallel.
In this case, the quadrilateral is sometimes a parallelogram.
No. A quadrilateral is a parallelogram when consecutiveangles are supplementary.
Yes, such a quadrilateral can exist.