Math Is Fun Forum

jxharmon

Member

Registered: 2007-01-08

Posts: 104

height of a cylinder??

a cylinder has a radius of 5in. If the volume of the cylinder is 250tt in. to 3rd power, what is the height of ther cylinder?  hint: the volume of a cylinder is given by V=pi r squared h, I am so confused,

luca-deltodesco

Member

Registered: 2006-05-05

Posts: 1,470

Re: height of a cylinder??

plug in your values of r and v, and itll give you the height

Last edited by luca-deltodesco (2007-02-14 05:01:34)

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jxharmon

Member

Registered: 2007-01-08

Posts: 104

Re: height of a cylinder??

sorry still don't understand these are the kind of problems that really confuse me big time???

luca-deltodesco

Member

Registered: 2006-05-05

Posts: 1,470

Re: height of a cylinder??

ok, as youve said, the volume of a cyulinder ios given by

, h being the height, r the radius, v the volume

whenever you are rearranging an equation, you have to do the same thing to both sides:

radius is 5
volume is 250

substitue the values into the equation

if you then plug that back into the original equation for v, you would have

Last edited by luca-deltodesco (2007-02-14 05:18:16)

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The Beginning Of All Things To End.
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jxharmon

Member

Registered: 2007-01-08

Posts: 104

Re: height of a cylinder??

I started to do that then thought I was wrong so a million thanks to you