Sita had to make a model of cylindrical Kaleidoscope for her science project. She wanted to use black chart paper to make the carved surface of the Kaleidoscope. What would be the area of chart paper required by her, if she wanted to make a Kaleidoscope of length 30cm with a 2.7cm radius (use pi= 22/7 )
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Radius of the base of the cylindrical kaleidoscope (r) = 3.5 cm.
Height (length) of kaleidoscope (h) = 25 cm.
Area of chart paper required = curved surface area of the kaleidoscope
= 2πrh
=2×22 /7×3.5× 25 cm 2
= 550 cm2
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Step-by-step explanation:
it is of class 9th
R.S Aggarwal book
go in 15 unit then open the example which is after 15.1 exercise
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