Find the radius of a cone with volume 199.23 cm3 and height 9 cm.

Question

anonymous · Answer

@mathmale mind helping with another :)

nikato · Answer

U can look here to find formula for volume of cone http://math.about.com/od/formulas/ss/surfaceareavol_2.htm

nikato · Answer

Plug in 199.23 for V
And 9 for h.
And then try to solve for r

anonymous · Answer

V=1/3 * pie * r square * h
Plug in the variables you have and sole for r 
Don't forget to square root it

anonymous · Answer

ok im lost as to how to eliminate pi...

nikato · Answer

So
199.23=1/3(pi)(r^2)(9)

199.23 =3(pi)(r^2)
--------    --------
3pi.            3pi

66.41
------  = r^2
   pi

Then square root both sides to find r

nikato · Answer

It'll be better to do it with a calculator

anonymous · Answer

so its 4.5 :)

anonymous · Answer

@nikato

nikato · Answer

Yea. Around there 4.5 or 4.6