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In a DeltaABC, A=(2pi)/3, b-c=3sqrt3 cm ...

In a `DeltaABC`, `A=(2pi)/3, b-c=3sqrt3 cm` and `area(DeltaABC)=(9sqrt3)/2 cm^2`. Then `a` is

A

`6sqrt3`

B

9cm

C

18cm

D

12cm

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The correct Answer is:
B
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