Two rings with radius R and r are let down in the soap water. Between them pellicle appeared (like in image).(adsbygoogle = window.adsbygoogle || []).push({});

Image: here all are symmetric ;)

problem: need to find y=f(x)

what i think:volume of figure is minim. maybe express volume via needed function, then get minimum of volume, and find this function.

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# Two rings and soap water

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