As equaçoes abaixo representam circunferencias. Determine o centro e o raio das circunferencias seguintes: a) x²+ y² + 18x= 0              b) x²+ y²= 16              c) x²+ y²+ 4x- 10y+ 20= 0

d) x²+ y²+ 4x+ 4y- 17=0
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