In the given figure, PQRS is a quadrilat...

In the given figure, PQRS is a quadrilateral. If QR = 18 cm and PS = 9 cm, then what is the area (in `cm^(2)`) of quadrilateral PQRS?

A

`(64 sqrt3)//3`

B

`(177 sqrt3)//2`

C

`(135 sqrt3)//2`

D

`(98 sqrt3)//3`

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