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Bab Koordinat KutubMatematika SMA Kelas X
(-2, 2) → x negatif dan y positif, maka di kuadran II
r = √(x² + y²)
r = √((-2)² + 2²)
r = √( 2 . 2²)
r = 2√2
tan a = y/x
tan a = 2/-2
tan a = -1
∠a = 135°
(2√2, 135°)