Posted by **Alison** on Thursday, February 2, 2012 at 6:58pm.

An inner tube for a bicycle has a diameter of 2 inches and measures about 82 inches along its circumference. What formula would you use to determine the numbers of cubic inches of air the inner tube can hold

- Math -
**Reiny**, Thursday, February 2, 2012 at 8:26pm
What you are asking for is the volume of a torus, which is quite a complicated problem.

What grade level would this be?

If you want an approximation ....

Assume we cut the tube and stretch it into a long cylinder.

The the volume would be π(1^2)(82 = 82π

or appr. 578 cubic inches.

Is this answer sufficient?

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