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

Posted by Sanket Kedia 6 years, 3 months ago

CBSE > Class 08 > Mathematics

1 answers

Gaurav Seth 6 years, 3 months ago

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

0Thank You

ANSWER

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CBSE > Class 08 > Mathematics