tentukan koordinat cartesius berikut Q(4,240°)

[tex]x = r.cos \: 240 \\ = 4.( - \frac{1}{2} ) \\ = - 2[/tex]
[tex]y = r.sin \: 240 \\ = 4.( - \frac{1}{2} \sqrt{3} ) \\ = - 2 \sqrt{3} [/tex]