Answers

2016-03-23T21:43:10+05:30
We know that perimeter of rectangle = curved surface area of cyclinder
therefore perimeter of rectangle = 2( l+b)
                                 = 2 ( 66 +12 )
                                 = 2 ( 78 )
                                =156 cm 
curvd surface area of cylinder = 2πrh now ...we will compare perimeter and csa and find value of r 
               2 x 22 x r x 12 = 156
                       7

              =R = 156  x 7 
                     2 x 22 x 12 
                       =91
                         44
value of r = 2.06 cm 


now volume of cylinder = πr2h......................this means that pie ..square of radius and height of cyclinder 

value of pie is 22/7

=  22 x 206 x 12 =     77.69 cm is volume of cyclinder 
    7 x  100
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