The radius of the circle, which touches the line x – y = 0 and is concentric with the circle x2 + y2 – 6x – 2y – 3 = 0 is

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The radius of the circle, which touches the line x – y = 0 and is concentric with the circle x2 + y2 – 6x – 2y – 3 = 0 is






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