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Mukta had to 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 would be the area of chart paper required by her, if she wanted to make a kaleidoscope of length 25 cm with 3.5 cm radius?

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750 cm

2

560 cm

2

550 cm

2

650 cm

2

answer is B.

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Detailed Solution

Given,

h = 25

cm,

r = 3.5

cm.
The area of the chart paper required = curved surface area of the kaleidoscope.
We know, the curved surface area of a cylinder is,
CSA=

2 π r h

CSA = 2 × 227 × 3.5 × 25

∵ π = 227

CSA

= 550

2

So, the area of the chart paper is 550cm2.
Therefore, the correct option is 2.

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