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Bab Koordinat PolarMatematika SMA Kelas X
1] (-5, 5) → x negatif dan y positif, maka di kuadran II
r = √(x² + y²)
= √((-5)² + 5²)
= √ (2 . 5²)
= 5√2
tan α = y/x
tan α = 5/-5
tan α = -1
α = 135°
(5√2, 135°)
2] (4√3, 4) → x positif dan y positif, maka di kuadran I
r = √(x² + y²)
= √((4√3)² + 4²)
= √(48 + 16)
= √64
= 8
tan α = y/x
tan α = 4/4√3
tan α = 1/√3
α = 30°
(8, 30°)