Question

A rectangular sheet of length 44cm and breadth 7is folded on the breadth to make a cylinder what is its surface area (CSA)

Answer 1

Answer:

If the sheet is rolled along its length then the circumference will be equal to the length of the rectangle.

∴2πr=44

∴r=

2×

7

22

44

∴r=7 cm

Also, height of the cylinder will be equal to the breadth of the rectangle.

∴h=18 cm

∴ volume of the cylinder =πr

2

h

=

7

22

×7

2

×18

=2772 cm

3