Koordinat kutub (33, -33)

[tex]r = 33 \sqrt{2} [/tex]
[tex] \tan(a) = \frac{y}{x} \\ tan \: a = \frac{33}{ - 33} \\ tan \: a = - 1[/tex]
berada di kw. 4 maka
[tex]a = 360 - 45 = 315[/tex]