# Math Help - another polar expression proplem

1. ## another polar expression proplem

caretesian coordinates: (-3,4)

polar coordinates: (5 , pi + arctan ( - 4/3))

Could somebody explain to me step by step how the angle, pi + arctan ( - 4/3), was determined from the cartesian coordinates?

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3. $
\left( { - 3,4} \right) \equiv \left( {5,\pi + \arctan \left( {\frac{{ - 4}}{3}} \right)} \right)
$

There. So... how do we find the angle?