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im a quite stuck on how to answer this question on resonant circuits. any help would be most appreciated!

## Homework Statement

a coil of inductance 220mH and resistance 6 ohms is connected in parrallel with a capacitor across a 230volt variable supply. if the circuit goes into resonance at a frequency of 9.9KHz determine:

i) the capacitance of the circuit taking into account the resistance?

## The Attempt at a Solution

i have tried working out XL with using the 2pi*f*L formula but wasnt sure if the resonace frequency was the correct frequency to use and also how would i then transpose the above ciruit information to give me C?

thank you very much for any help offered.