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 May 13th, 2019, 01:50 AM #1 Newbie   Joined: May 2019 From: moscow Posts: 4 Thanks: 0 function help needed. Assuming the height of a cylinder is h and h depends on the radius r function $\displaystyle h(r)= 50/\pi*r^2$. Area of cylinder => $\displaystyle A(r,h)= 2*\pi*r^2+2*\pi*r*h.$ form a function $\displaystyle A(r)=A(r,h(r))$, which basically means that the area of cylinder depends on its radius. My answer to this is $\displaystyle 2*\pi*r^2+(100*\pi*r)/(\pi*r^2)$ and I've reduced it to $\displaystyle 2*\pi*r^2+(100)/(r)$. Is this the correct answer? Thanks in advance. Last edited by skipjack; May 13th, 2019 at 07:40 AM. May 13th, 2019, 01:56 AM #2 Math Team   Joined: Jul 2013 From: काठमाडौं, नेपाल Posts: 901 Thanks: 61 Math Focus: सामान्य गणित Seems correct Thanks from dbag123 May 13th, 2019, 05:28 AM   #3
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 Originally Posted by MATHEMATICIAN Seems correct
thank you very much May 13th, 2019, 07:39 AM #4 Global Moderator   Joined: Dec 2006 Posts: 20,937 Thanks: 2210 Did you mean $\displaystyle h(r) = 50/\left(\pi*r^2\right)$ rather than $\displaystyle h(r) = 50/\pi*r^2$? May 13th, 2019, 07:51 AM   #5
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 Originally Posted by skipjack Did you mean $\displaystyle h(r) = 50/\left(\pi*r^2\right)$ rather than $\displaystyle h(r) = 50/\pi*r^2$?

the first one $\displaystyle 50/(pi*r^2)$ Tags function, needed Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post Realistonia Real Analysis 5 February 24th, 2013 06:23 AM fantom2012 Calculus 4 April 22nd, 2012 10:29 AM geeth416 Algebra 1 April 28th, 2010 08:38 AM likemike25 Algebra 9 December 11th, 2009 02:39 AM CutieCutiePi Algebra 2 October 28th, 2009 07:34 PM

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