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 Post subject: cylinder math
PostPosted: Wed Sep 01, 2010 2:15 pm 
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Accomplished Articulator

Joined: Thu Sep 27, 2007 3:02 am
Posts: 40
Location: Oklahoma, USA
Every couple of years I seem to come up against a problem that I know must be reasonably simple to solve, but nevertheless evades my ability come up with an answer. I always feel a little stupid after you confirm my initial thought that it should be simple. I'm always greatful for your response, however, and, as a fan, to know that you are still alive and kicking. I use the opportunity to read through you site and check up on your progress.

Here's my problem:

I know that a cylinder has a volume of 25 cubic milliliters and I know that the height of the cylinder is equal to the diameter. What is the height of the cylinder?


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 Post subject: Re: cylinder math
PostPosted: Thu Sep 02, 2010 12:49 pm 
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Your Host

Joined: Mon Jul 10, 2006 6:57 am
Posts: 204
Location: Sydney, Australia
Well, the volume of a cylinder is the surface area of the circular end multiplied by the height. We're given that the height and diameter of the circle are the same, so let's call that value x. The area of the circle is pi x, so the volume of the cylinder is pi x*x.

...and that should be more than enough to go on.

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