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sin 120° = y/4
sin (90°+30°) = y/4
cos 30° = y/4
1/2 √3 = y/4
y = 2√3
× = √r^2-y^2
= √(4)^2 - (2√3)^2
= √16 - 4√9
= √16 - 4.3
= √16-12
= √ 4
= 2
maka koordinat cartesiusnya (2, 2√3)