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In two concentric circles with centre O, the radius of the outer circle is $50$ cm. Chord AB of the outer circle is tangent to the inner circle at D. If length of AB is $96$ cm, then the radius of the inner circle is :
- (a)$14$ cm
- (b)$7$ cm
- (c)$24$ cm
- (d)$15$ cm
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Sol. (A) $14$ cm