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                                    A right circular cylindrical tunnel of diameter 2 m and length 40 m is to be constructed from a sheet of iron. The area of the iron sheet required in m2, is (a) 40 π (b) 80 π (c) 160 π (d) 200 π | 
                            
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Answer»  A right circular cylindrical tunnel of diameter 2 m and length 40 m is to be constructed from a sheet of iron. The area of the iron sheet required in m2, is (a) 40 π (b) 80 π (c) 160 π (d) 200 π  | 
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