The total surface area of a hollow cylinder, which is open on both sides is area of its base ring is and its height is 14cm, then the thickness of the cylinder is

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3.55cm

4.55cm

7cm

8cm

answer is A.

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Detailed Solution

We are given that the height of the cylinder as
Let the inner radius be r
and outer radius be R
Base Ring =
Question Image

Total surface area of the cylinder =3575 sq cm
Now, total surface area of a hollow cylinder = outer curved surface + inner curved surface area + 2(Area of the circular base)
Question Image

Substituting the value of

in equation (1), we get.
Question Image

So we have the thickness of the cylinder is 3.55 cm
So, option 1 is correct.

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