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What Are Some Suggestions for Checking an Answer and Identifying Mistakes?
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hi kingboy! 
you've included the area of the top surface of the cylinder
you've included the area of the top surface of the cylinder
kingboy
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tiny-tim said:hi kingboy!
you've included the area of the top surface of the cylinder
so that mean the total surface area need to -[tex]\pi[/tex]r^2(top circle)?
how about the method ? is that correct? because late need to dy/dx...
can someone help to correct or circle the wrong part?pls ...
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hi kingboy!
kingboy said:how about the method ? is that correct?i don't understand how you got equation circle-2…
you need to take the equations for A and V and to prove that A = 2V/r + 5πr2/3
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kingboy said:
Like tiny-tim pointed out you are including an extra circle. Think of your cylinder as having the top opened. Instead of that circle, you have your hemisphere on the top and not a flat circle.
kingboy
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o i know where i make mistake thank for helping ...