ubahlah dalam koordinat kartisius B (8,120°)

B(8,120°)

Koordinat kartesius
x = 8 cos 120° = 8 × (-1/2) = -4
y = 8 sin 120° = 8 × 1/2 √3 = 4√3

B(8,120°) = B(-4 , 4√3)