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A right circular solid cylinder has radi...

A right circular solid cylinder has radius of base 7 cm and height is 28 cm. It is melted to form a cuboid such that the ratio of its side is 2: 3: 6. What is the total surface area (in `cm^2`) cuboid?
एक सम वृत्ताकार ठोस बेलन के आधार की त्रिज्या 7 से.मी. तथा ऊँचाई 28 से.मी. है। इसे पिघलाकर एक घनाभ इस प्रकार बनाया जाता है कि उसकी भुजा का अनुपात 2:3:6 है। घनाभ का कूल पृष्ठिय क्षेत्रफल (`से.मी.^2` में) क्या हैं?

A

A)`root (3)(2156/3)`

B

B)`root (3)(2156/9)`

C

C)`root (3)(2148/9)`

D

D)`72(root (3)(1078/9))^2`

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