
Math General Math Forum  For general math related discussion and news 
 LinkBack  Thread Tools  Display Modes 
November 12th, 2016, 09:05 PM  #1 
Newbie Joined: Nov 2016 From: australia Posts: 1 Thanks: 0  Maths problem!!
I've been trying to solve this for a while and I can't get it right. Please help. Calculate the ratio of the volumes of two cylinders whose dimensions are in the ratio 5 : 8. Thanks. Last edited by skipjack; November 13th, 2016 at 03:01 AM. 
November 12th, 2016, 09:29 PM  #2 
Senior Member Joined: Sep 2015 From: CA Posts: 1,238 Thanks: 637 
$V = \pi r^2 h$ $\dfrac {V_5}{V_8} = \dfrac{\pi (5r)^2 (5h)}{\pi (8r)^2 (8h)}=\left(\dfrac 5 8 \right)^3=\dfrac{125}{256}$ 
November 13th, 2016, 03:21 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 17,204 Thanks: 1291 
If two solids, each with finite, nonzero volume, are geometrically similar, with a scale ratio of a:b, their volumes are in the ratio a³:b³.

December 20th, 2016, 09:56 PM  #4 
Newbie Joined: Dec 2016 From: United Kingdom Posts: 14 Thanks: 1  Question Maths problem!
Hi, You can use this simple formula: V = hπr^2. I am not an expert. So I Generally find online calculation tools, like MathCalculator, AshBox etc. If you want to find quick answers. 
December 21st, 2016, 08:28 AM  #5 
Math Team Joined: Jan 2015 From: Alabama Posts: 2,489 Thanks: 630 
But what if you want to learn? I would hope that was why most people came here!


Tags 
maths, problem 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Maths Problem  mastgaurav001  Elementary Math  2  February 23rd, 2016 03:36 AM 
Help on a maths problem  margabam23  New Users  0  August 30th, 2014 11:12 AM 
Maths Problem  Rola Ahmed  Algebra  6  April 18th, 2013 01:26 PM 
Please help on maths problem  neoth  Calculus  3  May 7th, 2012 01:55 AM 
Maths Problem  Kiranpreet  Algebra  7  September 2nd, 2007 05:43 AM 