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Here is a pictre that shows the problem:

enter image description here

What would be the ratio of the red to blue, and if these were then made spheres how could one find the portion of the surface area that would be inside the other sphere.

Edit: I have found the red to be 1/3 of the circumference for circles, but I'm still not sure how to go about the question for spheres.

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    Oops, thanks. fixed.2012-11-11

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