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I was doing some reading through the forum and noticed a question about De Moivre's theorem and realized that I don't know how to find r at all.
I was wondering why the radius is 2 when you take the absolute value of (sqrt3 + i)
You could be required to calculate the "modulus" of a complex number.
On an Argand Diagram, a complex number's "modulus" is it's distance from the origin .
Pythagoras' theorem calculates this
[you can draw a right-angled triangle with hypotenuse being the line from to ].
For any further questions you might have, I find this video to be very informative:
YouTube - The Polar Form of Complex Numbers