CIRCLES2 HELP required please

Can someone give me a simpler explanation to this problem https://www.codechef.com/COOK109B/problems/CIRCLES2

I cannot understand the editorial
Thanks

I’ll update this answer later…till then…

Think what will happen if you draw a line through the centres of 2 circles ?

What will be the property of that line ?

Hey Thank you so much for replying!!! Can you please elaborate.

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