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Because when written in its polar form:\[\arg(re^{i\theta})=\theta\]

where does a and b go?

I don't know how to convert it to its polar form, could you help me understand that formula?

|dw:1359087681895:dw|

r is the length of the complex number, given by using pythagorean theorem:\[r=\sqrt{a^2+b^2}\]

the angle is the argument. You use inverse tangent to get it.\[\theta=\tan ^{-1}(\frac{a}{b})\]

oh so r = modulus of the point (a,b)?

that is correct

so when asked arg z, it is the theta that they are asking for?

ack! thanks for pointing out my mistake, it should be b/a in the formula i posted.

oh ok :)

oh i get it now!! I really appreciate you helping me!! Thank you so much!!