use double integral to prove surface area of right circular cylinder with...

• Apr 8th 2013, 12:28 PM
sluggerbroth
use double integral to prove surface area of right circular cylinder with...
radius a>0 and height h>0 is given by 2piah
• Apr 8th 2013, 01:11 PM
topsquark
Re: use double integral to prove surface area of right circular cylinder with...
Quote:

Originally Posted by sluggerbroth
radius a>0 and height h>0 is given by 2piah

Please show us what work you have been able to do for this.

-Dan
• Apr 8th 2013, 03:49 PM
sluggerbroth
Re: use double integral to prove surface area of right circular cylinder with...
i don't do well with proofs and need some direction to start
• Apr 8th 2013, 04:00 PM
sluggerbroth
Re: use double integral to prove surface area of right circular cylinder with...
Area=pi r^(2) and area=2pirh

i am told arc sin x =1/(1-x^(2))^(1/2) might be good to know
• Apr 9th 2013, 06:58 AM
HallsofIvy
Re: use double integral to prove surface area of right circular cylinder with...
A thin "layer" at height z will have surface area $2\pi a dz$. Integrate that from 0 to h. No, you do not need that equation (which is not true anyway).

I find this very peculiar. You have posted a number of fairly standard Calculus problems but protested that you have no idea how to even begin? Are you not taking a Calculus course? Do you not have a calculus textbook?