Question

PQRS is a quadrilateral. PR and
QS intersect each other at O. In
which of the following cases,
PQRS is a parallelogram?​

Answer 1

Answer:

If the opposite side or angles of quadrilateral PQSR are congurant then it is a parallelogram......

And if the sum of two interior angles are 180° then it's a parallelogram..

I hope this will help you...