Math, asked by ajaybhimsinghpec1bn, 1 year ago

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

Answers

Answered by sonabrainly
4

Here,length of paper = Circumference = 22 cm

Width of paper = height of cylinder = 10 cm

Then,


Circumference = 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

Total surface area = 220 +2 x (22/7)x 3.5²


= 220 + 77


= 297 cm²





ajaybhimsinghpec1bn: answer is wrong
Answered by smartyAnushka
0
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
Total surface area = 220 +2 x (22/7)x 3.5²

= 220 + 77

= 297 cm²

Thanks
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