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**Quick question on 3 phase before my final!!**

**1. Homework Statement**

In equations for 3 phase power there is an angle that is mentioned, but I dont know if this is the angle of the impedance or another angle. Im a little confused. The equations are below.

**2. Homework Equations**

P=(VrmsIrms)cos([tex]\theta[/tex])

Q=(VrmsIrms)sin([tex]\theta[/tex])

Any help?