titik k (3,-3√3) jika dinyatakan dalam koordinat kutub adalah.....
K = (3 , - 3√3)
r² = x² + y²
r² = 3² + (3√3)²
r² = 9 + 9(3)
r² = 9 + 27
r² = 36
r = 6
cos a = x / r
cos a = 3 / 6
cos a = 1/2
< a = 60°
Koordinat Kutub K = (6 , 30°)
K = (3 , - 3√3)
r² = x² + y²
r² = 3² + (3√3)²
r² = 9 + 9(3)
r² = 9 + 27
r² = 36
r = 6
cos a = x / r
cos a = 3 / 6
cos a = 1/2
< a = 60°
Koordinat Kutub K = (6 , 30°)