Ubahlah koordinat kutub menjadi koordinat cartesius P(1,210°)---->P(x,y) Ubahlah koordinat cartesius menjadi koordinat kutub P(2,2√3)---->P(r,alpha°)

nomor 1
[tex]x = r.cos \: 210 \\ = 1.( - \frac{1}{2} \sqrt{3} ) \\ = - \frac{1}{2} \sqrt{3} [/tex]
[tex]y = r.sin \: 210 \\ = 1.( - \frac{1}{2} ) \\ = - \frac{1}{2} [/tex]

nomor 2
[tex]r = \sqrt{ {2}^{2} + (2 { \sqrt{3} )}^{2} } \\ = \sqrt{4 + 12} \\ = \sqrt{16} \\ = 4[/tex]
[tex]tan \: a \: = \frac{y}{x} \\ \\ tan \: a = \frac{2 \sqrt{3} }{2} \\ \\ tan \: a = \sqrt{3} \: \: (kw.1) \\ a = 45[/tex]