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In the given figure, tangents $PA$ and $PB$ to the circle centred at $O$, from point $P$ are perpendicular to each other. If $PA = 5$ cm, then length of $AB$ is equal to
- (a)$5$ cm
- (b)$2\sqrt{5}$ cm
- (c)$5\sqrt{2}$ cm
- (d)$10$ cm
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(B) $5\sqrt{2}$ cm