when does following two circles intersect at two distinct points?

In the following question what will be the radius if two circles intersect at two distinct points Question : The circles (x-1)^2+(y-3)^2=r^2 and x^2+y^2-8x+2y+8=0 intersect at two distinct points. Which of the following is correct? r=1 1<r<2 r=2 2<r<8 Solution :…

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