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In two concentric circles with centre O, the radius of outer circle is $25$ cm. Chord PQ of the outer circle is tangent to the inner circle at R. If PQ = $14$ cm, then the radius of the inner circle is :
- (a)$\sqrt{429}$ cm
- (b)$24$ cm
- (c)$\sqrt{674}$ cm
- (d)$20$ cm
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Answer: (B) $24$ cm