Hi guys,

thanks a lot for your help and explanation.

I got a hang of the question. The only thing that I am confused

about is -

surface area of each end= pi ( R^2- r^2) = pi (16-9)

OR

total area of the two ends = 2[pi* (r1^2 - r2^2)]

(both are same)

Ya, so how do we determine total surface area of two ends. when are we suppose to use that. And how did you get the formula 2*pi*(R^2 - r^2)

Cheers,

GR