If a circle of radius b units with centre at (0,b) touches the line y=x-\sqrt2,then what is the value of b ? [NDA I 2016]

UPSC NDA I 2016 Mathematics Solved Paper

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If a circle of radius b units with centre at (0,b) touches the line y=x−√2,then what is the value of b ?

[NDA I 2016]

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