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r² = x² + y²
= (√3)² + 1²
= 3 + 1
= 4
r = √4
r = 2
tan α = y/x
= 1 / √3
α = 60°
∴ A (√3 , 1) ⇒ (2 , 60°)
b) B (√2 , -√2) ⇒ x = √2 ; -√2 ( dikuadran II)
r² = (√2)² + (√2)²
= 2 + 2
= 4
r = √4
= 2
tan α = y/x
= - √2 / √2
= 1
α = 135°
∴ B (√2 , - √2) ⇔ (2, 135°)