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a = 120°
Koordinat Kartesius = ( x, y )
Dengan
x = r × cos a
x = 9 × cos 120°
x = 9 × (-1/2)
x = -9/2 atau -4,5
y = r × sin a
y = 9 × sin 120°
y = 9 × (√3 / 2)
y = 9√3 / 2
( x, y ) = ( -9/2, 9√3 /2 )