Initially we are giving some points to know how to check whether the given quadrilateral is a parallelogram or not.
Point 1
If two pairs of opposite sides are parallel then the given quadrilateral is a parallelogram
2) if two pairs of opposite sides are equal then the quadrilateral is a parallelogram
3) if one pair of opposite side both parallel and equal then the quadrilateral is a parallelogram.
4) if two pairs of opposite angles are equal then the quadrilateral is a parallelogram
5) if one angle is supplimentary to both consecutive angles then the quadrilateral is a parallelogram
6) if diagonals of the quadrilateral is bisects each other then the quadrilateral is a parallelogram
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