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Let C(1) be the circle of radius r > 0 ...

Let `C_(1)` be the circle of radius `r > 0 ` with centre at `(0,0)` and let `C_(2)` be the circle of radius `r` with centre at `(r,0)` .The length of the arc of the circle `C_(1)` that lies inside the circle `C_(2)` ,is

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