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CBSE Class 9 Answered

44cm length and 18cm breath of revangle paper is round along its length to create a cylinder.then what is its total surface area
Asked by 7308524916parul | 24 Sep, 2018, 07:39: AM
answered-by-expert Expert Answer
 
The rectangular paper 44 cm × 18 cm is round along its length to create a cylinder.

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

The height of the cylinder is 18 cm and circumference is 44 cm.

 
Circumference = 2begin mathsize 16px style straight pi end styler = 44 cm 
Therefore total surface area = 2begin mathsize 16px style straight pi end styler h  = 44 × 18 = 792 cm2
Answered by Yasmeen Khan | 24 Sep, 2018, 10:13: AM
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