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Two concentric circles are of radius 15 ...

Two concentric circles are of radius 15 cm and 9 cm. What is the length of the chord of the larger circle which is tangent to the smaller circle?
त्रिज्या 15 सेमी तथा 9 सेमी वाले दो संकेंद्री वृत्त हैं | बड़े वृत्त की जीवा की लंबाई कितनी होगी जो छोटे वृत्त पर स्पर्श रेखा है ?

A

24 cm

B

18 cm

C

20 cm

D

25 cm

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