What is the angle theta value?

[charmcaster.engg]

What is the angle theta value for a 5.6

F capacitor and a 50-ohm resistor in series with a 1.1 kHz, 5 Vac source?

 

[Harald Kapp]

We will not give a concrete answer, we will help you arrive at your own solution.

I suppose theta is meant to be the phase shift between voltage and current. Your circuit is a simple RC circut and can be analyzed using the standard equations, see here.