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 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: 1,109 Thanks: 580 $V = \pi r^2 h$ $\dfrac {V_5}{V_8} = \dfrac{\pi (5r)^2 (5h)}{\pi (8r)^2 (8h)}=\left(\dfrac 5 8 \right)^3=\dfrac{125}{256}$
 November 13th, 2016, 03:21 AM #3 Global Moderator   Joined: Dec 2006 Posts: 16,782 Thanks: 1238 If two solids, each with finite, non-zero 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 Math-Calculator, AshBox etc. If you want to find quick answers.
 December 21st, 2016, 08:28 AM #5 Math Team   Joined: Jan 2015 From: Alabama Posts: 2,350 Thanks: 590 But what if you want to learn? I would hope that was why most people came here!

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