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Circular discs 5 mm thickness, are placed one above the other to form a cylinder of curved surface area 462 cm. Find the number of discs, if the radius is 3.5 cm.

Answer

Circular discs 5 mm thickness, are placed one above the other to form a cylinder of curved surface area 462 sq cm. if the radius is 3.5 cm.
As per given the thickness of disc =
Radius of disc =3.5 cm
Cuvered surface area of cylinder =462 sq cm
.......................................(1)
Let number of discs are x
The height of cylinder =h= 
............................(2)
From equation (1) and (2) we get
discs


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