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In the given figure, chord $AB$ of the larger circle touches the smaller circle at $C$. If both the circles have the same centre $O$, then the length of $BD$ is :
- (a)$1\text{ cm}$
- (b)$2\text{ cm}$
- (c)$3\text{ cm}$
- (d)$4\text{ cm}$
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(B) $2\text{ cm}$