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A hollow cylinder is made up of metal. The difference between outer and inner curved surface area of cylinder is 352 `cm^2`. Height of the cylinder is 28 cm. If the total surface area of this hollow cylinder is 2640 `cm^2`, then what are the inner and outer radius (in cm)?
धातु का एक खोखला बेलन बनाया गया है । बेलन के बाह्य तथा आंतरिक वक्र पृष्ठिय क्षेत्रफल के मध्य 352 `से.मी.^2` का अंतर है। बेलन की ऊँचाई 28 से.मी. हैं। यदि इस खोखले बेलन का कूल पृष्ठिय क्षेत्रफल 2640 `से.मी.^2` है, तो बेलन की आंतरिक तथा बाह्य त्रिज्या (सेमी. में) कया हैं।

A

4,6

B

10,12

C

8,10

D

6,8

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