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Two concentric circles are of radii 15cm...

Two concentric circles are of radii `15cm` and `9cm`. What is the length of the chord of the large circle which is tangent to the smaller circle? दो संकेंद्रित वृत्तों की त्रिज्याएं `15 cm` और `9 cm` है| बड़े वृत की जीवा की लंबाई कितनी है जो छोटे वृत्त पर स्पर्श रेखा है|

A

24cm

B

18 cm

C

20 cm

D

25 cm

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