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Savitri had `t o` make a model of a cylindrical Kaleidoscope for her science project. She wanted to use chart paper to make the curved surface of the Kaleidoscope. What should be the area of chart paper required by her, if she wanted to make a Kaleidoscope of length 25 cm with a 3.5 cm radius?

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Length`=25 cm`
Radius`=3.5 cm`
Area of chart paper required `=`CSA of cylinder
`=2pirh`
`=2times22/7times3.5times25`
`=550 cm^2`
`therefore` Area of chart paper required `=550 cm^2`
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