Koordinat kutub jika p(-1,1)

Bab Trigonometri
Matematika SMA Kelas X

(-1, 1) → x negatif dan y positif → kuadran II

r = √(x² + y²)
r = √((-1)² + 1²)
r = √(1 + 1)
r = √2

sin α = y/r = 1/√2 = 1/2 √2
α = 135°

(√2, 135°)