please help with finding the volume of a cone.

how can i rearrange formula for r in terms of v and h

no good at trigonometry. anybody help with simple explanations:confused:

Printable View

- Sep 1st 2007, 11:27 AMbobbie bruceformulas and solving equations
please help with finding the volume of a cone.

how can i rearrange formula for r in terms of v and h

no good at trigonometry. anybody help with simple explanations:confused: - Sep 1st 2007, 11:31 AMred_dog
$\displaystyle \displaystyle V=\frac{\pi r^2h}{3}$

Now solve for $\displaystyle r$ - Sep 2nd 2007, 05:05 AMbobbie bruce
- Sep 2nd 2007, 05:12 AMearboth
Hello,

I start at: $\displaystyle V_{cone}=\frac{1}{3} \cdot \pi \cdot r^2 \cdot h$

Multiply both sides by 3:

$\displaystyle 3V = \pi \cdot r^2 \cdot h$ Divide by $\displaystyle (\pi \cdot h)$ :

$\displaystyle \frac{3V}{\pi \cdot h} = r^2$ Calculate the square-root:

$\displaystyle \sqrt{\frac{3V}{\pi \cdot h}} = r$ ... and here you are.