All,

I'm an Advanced studying for my Extra, and so far I am getting 66% on
the practice exams without even studying after about 3 years of
homebrewing. I need a few extra points to make it over the top, and
since I am a builder (of sorts) I would like to do it using the
electrical principles part of the exam.

However, the questions pool provides the answers but not how to get
them. I'd rather be able to understand how to arrive at it without a
calculator.

Problem class 1: impedance and phase angle of RLC parallel circuit
where component values and frequency are known.

Problem class 2: impedance and phase angle of RLC series circuit where

component values and frequency are known.

Could I calculate these graphically using tip-to-tail summation of
impedance vectors?

From what I understand, |Z| = 2 pi F L, |Z| = 2 pi / (F C), |Z| = R
But how can I get the phase angle or the conjugate pair so that I can
do the vector addition?

Thanks in advance,

The Eternal Squire