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A rectangular strip $25 cm × 7 cm$ is rotated about the longer side. Find the total surface area in $c m 2$ of the solid thus generated.

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answer is B.

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Detailed Solution

Here,
It is given a rectangular strip of size

.
Let the radius of the cylinder be `r’ cm.
Height of cylinder becomes =

Radius =

The total surface area of the cylinder =

2 π r h + r

The total surface area of the cylinder

= 2 × 227 × 7 × 25 + 7

The total surface area of the cylinder

= 2 × 227 × 7 × 32

The total surface area of the cylinder

Total surface area of cylinder is

.
Hence option (2) is correct.

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A rectangular strip 25 cm×7 cm is rotated about the longer side. Find the total surface area in c m 2 of the solid thus generated.

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A rectangular strip $25 cm × 7 cm$ is rotated about the longer side. Find the total surface area in $c m 2$ of the solid thus generated.