Answer:
Step-by-step explanation:
All the polygons that have four sides are quadrilateral.
Parallelogram is a special type of quadrilateral.
In parallelogram, opposite sides are equal and parallel and opposite angles are equal and the adjacent angles are supplementary.
So, parallelograms are always quadrilateral, as they have four sides
But quadrilateral are only sometimes as it doesn't always have the properties of parallelogram.
