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P Q R S is a quadrilateral. P R\ a n d\ ...

`P Q R S` is a quadrilateral. `P R\ a n d\ Q S` intersect each other `O`. In which of the following cases, `P Q R S` is a parallelogram?
(i) _∠P = 100°, ∠Q = 80°, ∠R = 95°
(ii) `/_P=85^0,\ /_Q=85^0,\ /_R=95^0`
(iii) `P Q=7C M ,\ Q R=7C M ,\ R S=8C M ,\ S P=8C M`
(iv) `O P=6. 5 c m ,\ O Q=6. 5 c m ,\ O R=5. 2 c m ,\ O S=5. 2 c m`

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