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a rectangular sheet of paper 16cm …

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a rectangular sheet of paper 16cm by 3.5cm,is rotated about the longer side. find the total surface area of the solid thus generated

Posted by Guna Kaviya 8 years, 9 months ago

Naveen Sharma 8 years, 9 months ago

Ans.

Length of rectangular sheet = 16cm

Breadth of rectangular sheet = 3.5cm

When we rotate a rectangle about its one side, the solid thus formed is cylinder.

height of cylinder formed = 16cm

Radius of cylinder formed = {tex}{3.5\over 2\pi}{/tex}

Total Surface Area of cylinder = {tex}2\times \pi \times{ 3.5\over 2\pi}\times 16= 56cm^2{/tex}

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