Considere as circunferências λ1, dada por x2 + y2 = 1, e λ2, dada por x2 + y2 – 4x – 4y + 4 = 0.?

A distancia entre seus centros é:

a) 3

b) 2 raiz de 2

c) raiz de 5

d)2

e)raiz de 5 sobre 2

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