Question

A rectangular piece of paper is 22 cm in length and 10 cm in width. It is rolled into a cylinder along its length. Find the surface area of this cylinder.

Answer 1

Hey mate here your answer

cicumference of the of the box of a cylinder =
lenght of a rectangle=2/πr

r=22cm

h=10cm
csa= 2/πrh = 22×10

220cm^2

Answer 2

Solutions

length of paper = Circumference = 22 cm

Width of paper = height of cylinder = 10 cm
Then,

Circumference of circle = 22 cm

=> 2πr = 22

=> 2x(22/7) x r = 22

=> r = 7/2 = 3.5 cm

Now,

Curved Surface Area of cylinder = 2πrh

= 2 x (22/7) x 3.5 x 10

= 220 cm²

Thanks