How to Calculate Un-Ordinary Circumference?

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optics.tech
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Hi,

Can someone please tell me how to calculate circumference when two cylinders are intersects each other marked with red color such as below image?

Thanks in advance

Huygen

http://i44.tinypic.com/b9a93q.png
 

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Probably parametrize the curve of intersection, then do it as an integral.
 

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