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S₂=(-1, 1) , r₂²=72, r₂=6√2
|S₁S₂|²=(-1-3)²+(1-5)²=16+16=32
|S₁S₂|=√32 = 4√2
|r₂- r₁| = 4√2
Odp. Okregi sa styczne wewnetrznie.