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Two circles of radius 15 cm and 12 cm in...

Two circles of radius 15 cm and 12 cm intersect each other, and the length of their common chord is 18 cm. What is the distance (In cm) between their centres?
15 सेमी तथा 12 सेमी त्रिज्या वाले दो वृत्त एक दूसरे को काटते हैं तथा तथा उनकी उभयनिष्ठ जीवा की लंबाई 18 सेमी है | उनके केंद्रों के बीच की दूरी ज्ञात करें |

A

`18 + sqrt7`

B

`15 + sqrt7`

C

`12 + 2sqrt7`

D

`12 + 3sqrt7`

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