Math Is Fun Forum

leeds

Member

Registered: 2007-03-12

Posts: 3

finding the radius of a cylinder

hello guys nice forum you have here hope you can help me with some what you may find as simple questions

I am not much good when it come to this  type of thing but i need to help my lad with is home work so i thought you guys may be able to help me help my son to understand some maths

the question i want to ask is this

I have a cylinder volume 320 pie cm3  .....  hieght 3.2 cm   

I need to be able to find the radius of the cylinder, any one got ant idea

thanks guys:)

mathsyperson

Moderator

Registered: 2005-06-22

Posts: 4,900

Re: finding the radius of a cylinder

The volume of a cylinder is given by πr²h, where r is its radius and h is its height.

By substituting the height and volume that you're given, you can say that 320π = 3.2πr².
From there, you just solve to find r.
To do that, you'd get r² on its own and then take the square root of both sides.

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It wanted to be normal.

leeds

Member

Registered: 2007-03-12

Posts: 3

Re: finding the radius of a cylinder

Thx for the explanation its very nice of you to reply so quickly

but can you do the actualy sum from start t finish so i can see wot it is i have to do in wot order, so i can understand it better

cheers

luca-deltodesco

Member

Registered: 2006-05-05

Posts: 1,470

Re: finding the radius of a cylinder

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The End Of All Things To Come.

leeds

Member

Registered: 2007-03-12

Posts: 3

Re: finding the radius of a cylinder

thanks for your reply , it was very helpful to me . i also understand the previous post more and can see wot you were saying now i have seen the sum, thx for the help.

Cheers

Last edited by leeds (2007-03-12 10:17:18)