PQRS is a quadrilateral. PR and QS intersect each other at O. In which of the following cases, PQRS is a parallelogram?
∠P=100^° , ∠Q=80^° , ∠R=100^°

Question

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

Philoid · Accepted Answer

∠P=100^° , ∠Q=80^° , ∠R=100^°