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r² = x² + y²
r² = (5√3)² + (-5)²
r² = (25 * 3) + 25
r² = 75 + 25
r² = 100
r = √100
r = 10
tan α = y/x
tan α = (-5) / 5√3
tan α = -√3
α = 120° atau 300°
Koordinat kutub = (10 , 120°) atau (10 , 300°)