two concentric circles of radii \( 3 \mathrm{~cm} \) and \( 5 \math...

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two concentric circles of radii \( 3 \mathrm{~cm} \) and \( 5 \mathrm{~cm} \) are given. Then length of chord \( B C \) which touches the inner circle at \( P \) is equal to
(a) \( 4 \mathrm{~cm} \)
(b) \( 6 \mathrm{~cm} \)
(c) \( 8 \mathrm{~cm} \)
(d) \( 10 \mathrm{~cm} \)
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