Multiple polar coordinates for one coordinate?

Adding $2\pi$ to the degree will result in the same thing, since radius is not changing so another possible polar coordinate to express $(3, \frac{3\pi}{4})$ is $(3, \frac{11\pi}{4})$.

If we have a negative degree than, it essentially flips the side so:

$(-3, \frac{7\pi}{4})$ and $(-3, \frac{-\pi}{4})$ are all equal. These are our three.