1.

The lateral surface area of a hollow cylinder is 6446 cm ^ 2 . It is cut along its height and found a rectangular sheet of width 22cm. Find the perimeter of rectangular sheet?​

Answer»

HOLLOW cylinder is converted into a rectangular sheet

So, Area of cylinder and sheet must be the same

Curved SURFACE area of hollow cylinder = Area of rectangular sheet

6446=L×B

6446=L×22

6446/22=L

L=6446/22

L=293

Now,

Perimeter of sheet=2(L+B)

=2×(293+22)

=2×315

=630



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