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Length of a chord of a circle is 24 cm. If distance of the chord from the centre is 5 cm, then the radius of that circle is ____.

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Length of a chord of a circle is 24 cm. If distance of the chord from the centre is 5 cm, then the radius of that circle is ____. 

(A) 12 cm 

(B) 13 cm 

(C) 14 cm 

(D) 15 cm

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(B) 13 cm

OA2 = AC2 + OC2 

∴ OA2 = 122 + 52 

∴ OA2 = 169

∴ OA = 13 cm

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