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You need to know the power factor, the phase angle, or the KVA in order to determine KVAR from KW.
Power factor is the cosine of the phase angle between voltage and current, and is also the ratio of KW over KVA.
Once you know one of those other things, you simply consider that reactive power factor is the sine of the phase angle between voltage and current, and is also the ratio of KVAR or KVA.
It is simple arithmetic from there. You don't even need trigonometry, as I've already given you the ratios.
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