# A rectangular sheet of metal foil with dimensions 66cm*12cm is rolled to form a cyclinder of height=12cm.Find th volume of the cyclinder

1
Log in to add a comment

Log in to add a comment

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