As coordenadas do centro e o raio da circunferência de equação λ : x² + y² +2 x + 2 Y - 2 = 0 são:
a)C ( 1,1) e r = 2
b) C ( - 1, 1 ) e r = 4
c ) C ( 1, - 1 ) e r = 4
d) C ( -1 , - 1) e r = 2
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