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r = √x²+y² = √4²+6² = √(16+36) = √52 = √(4x13) = 2√3
∅ = tan⁻¹ (y/x) = tan⁻¹ (6/4) = 56,3⁰
maka koordinat kutubnya :
(r,∅) = (2√3 , 56,3⁰)