NDA Math Circle

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For the next two (2) items that follow :
Consider the two circles
(x−1)2+(y−3)2=r2 and x2+y2−8x+2y+8=0
[NDA I 2016]
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Question : 19 of 26
 
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What is the distance between the centre of the two circles ?
[NDA I 2016]
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