how to calculate volume of a sphere by its circumference (37)

You divide circumference by Pi, so we have:

37/Pi=11.78 cm-the diameter of the baloon

11.78/2=5.89 cm-the radius of the baloon

Volume=4/3 X Pi X r^3

V=4/3 X 3.141592 X 5.89^3

V=4/3 X 3.141592 X 204.336469

V=855.922.....cm^3-The volume of the baloon.

Thankyou😃

I didn't get the chance to study algebra or geometry. Now I would like to learn what I need to know as I go. Heres the thing!  I am conducting an experiment which I want school children to be able to replicate.  More about that later.  However having received your feedback on the circumference of a sphere and its volume,  I need to dramatically change my equipment for the experiment. I now have a sphere which is 2 cm in diameter .  I will be exhaling  into this Sphere ( it's actually a small rubber water bomb).  My breath will contain 40,000 ppm carbon dioxide.   The experiment container that the seeds are in will have air in it  which is 400 ppm cabin dioxide.  I want to build the carbon dioxide levels up to  around 1200 ppm. It doesn't matter if it's well in excess of 1200. It can go up to 8000 for this experiment. 

Anyway as my algebra is still not up to this yet.could you pls give me volume Of a 1cm radius sphere. And the formula.

Also do you run free courses on beginner algebra on this site, or can you recommend a site.  I would like to be able to join in a forum as you have here and learn from you.

regards

judy

 I am conducting an experiment 

Oops, I forgot to give you the volume of the container. It will be either 4, 6 or 8 litres.

Find the diameter of the sphere. Then use the formula

V=4/3πr3

(volume equals four thirds pi radius cubed)