In a A B C ,A=(2pi)/3,b-c=3sqrt(3)c m a...

In a ` A B C ,A=(2pi)/3,b-c=3sqrt(3)c m` and area `( A B C)=(9sqrt(3))/2c m^2dot` then `' a '` is `6c m` b. `9c m` c.`18c m` d. none of these

`6sqrt(3) cm`

9 cm

18 cm

6 cm

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