Posted by **Cendrillion** on Sunday, August 22, 2010 at 10:07am.

A tennis ball can in the shape of a right circular cylinder holds 3 tennis balls snugly. If the radius is 3.5cm, what % of the tennis ball can is occuppied by air?

Where do I start?

- geometry -
**bobpursley**, Sunday, August 22, 2010 at 11:49am
I will be happy to critique your thinking on this.

- geometry -
**Cendrillion**, Sunday, August 22, 2010 at 5:12pm
I used a visual and calcutated the height as 10.5cm. The radius would be half of the 3.5 to equal 1.75. I used the formul v=pie squared (x) height. I get 101.02 for the volume. I'm not sure what I am supposed to do next. Am I even approaching this the correct way?

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