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r2 = x2 + y2
r2 = -5^2 + (-5)^2
r2 = 25 + 25
r2 = 50
r = 7,07
tan a = y/x
tan a = -5/-5
tan a = 1
a = 45 atau 225
Jadi titik = (7.07 , 225) atau (7.07 , 45)