# another polar expression proplem

• February 24th 2008, 06:39 AM
billym
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?
• February 24th 2008, 06:42 AM
galactus
Try previewing your post before you submit it. You didn't surround your LaTex in
Code:

 [tex][\math]
• February 24th 2008, 07:38 AM
billym
$
\left( { - 3,4} \right) \equiv \left( {5,\pi + \arctan \left( {\frac{{ - 4}}{3}} \right)} \right)
$

There. So... how do we find the angle?
• February 24th 2008, 07:53 AM
Peritus