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Mathematics 7 Online
OpenStudy (anonymous):

What is the value of x, if the volume of the cone is 12pi m^3?

OpenStudy (anonymous):

OpenStudy (anonymous):

@eric_f

OpenStudy (anonymous):

How would I do this?

OpenStudy (mertsj):

\[V=\frac{1}{3}\pi r^2 h\]

OpenStudy (anonymous):

volume of a cone is 1/3pi*radius^2*height

OpenStudy (mertsj):

Plug into that formula and solve for h which is x in your drawing.

OpenStudy (anonymous):

So is 4 right?

OpenStudy (mertsj):

no

OpenStudy (anonymous):

Darn, I'm not quite sure what I did wrong. How did you set yours up?

OpenStudy (mertsj):

Show how you substituted into the formula.

OpenStudy (anonymous):

One second.

OpenStudy (anonymous):

12pi = 1/3 *pi * 3^2

OpenStudy (mertsj):

I apologize. I used 6 for the radius. Your answer of 4 is correct.

OpenStudy (anonymous):

Yay :)

OpenStudy (anonymous):

Thanks!

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