Tentukan koordinat kartesius dari koordinat kutub (3,2/3)Π

(3, 2/3π)

r = 3
θ = 2/3π = 2/3 x 180° = 120°

x = r . cos θ = 3 . cos120° = 3 x (-1/2) = -3/2

y = r. sin θ = 3 . sin 120° = 3 x √3/2 = 3√3/2

koordinat kartesiusnya (-3/2, 3√3/2)