Question

find the total surface area of a cylindrical pipe of thickness 2 cm . The external diameter of the pipe is 21cm and its length is 3m . ​​

Answer 1

Explanation:

The total surface area of the cylindrical pipe is 596.6 square centimeter

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Answer 2

Answer:

So, let's convert all the units from centimetres to metres.

Then, Thickness = 0.02 meters

External diameter = 0.21 metres

Length is already in meters.

Now, We know that radius is half of the diameter then,

External Radius = Half of external diameter

External Radius = 0.105 metres.

Now with basic visualisation it is clear that

Internal Radius = External Radius - Thickness

Internal Radius = 0.105 metres - 0.02 meters

Internal Radius = 0.103 metres

Now, Total surface area for a hollow cylinder is-

$2\pi \times ( outer \: radius \: + inner \: radius) \times (height \: + \ outer \: radius \: - inner \: radius)$

Putting all the values and by the mathematical calculations.

We get the value of the total surface areas as

4.025 square metres.

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