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In two concentric circles centred at O, a chord AB of the larger circle touches the smaller circle at C. If $OA = 3.5 \text{ cm}, OC = 2.1 \text{ cm}$, then AB is equal to
- (a)$5.6 \text{ cm}$
- (b)$2.8 \text{ cm}$
- (c)$3.5 \text{ cm}$
- (d)$4.2 \text{ cm}$
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Ans: (A) $5.6 \text{ cm}$