gotta have a solution for this one

Asked by  | 20th Jan, 2009, 08:43: PM

Expert Answer:

Remember that to find the volume of the cylinder we need the radius and the height.The height is given, so out rask is to find the radius.

Let the radius of the cylinder be r.

The circular faces have same area.Each area =

So , the sum of the areas of the circular faces =

We know that the curved surface area of a cylinder of radius r and height h =

According to question,

=2*()

So, substituting h=10.5  and solving the above equation we get,

r=7 cm

 

Answered by  | 21st Jan, 2009, 11:59: AM

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