To recognize rapidly the pattern of an intersection of n cylinders the following technique is useful.

 

The generalized angle bisection method is best described in the following picture


 


Start in the corners and construct slightly curved lines. Consider also bisecting lines of imaginary corners outside the polygon, which are formed of not immediate neighbours of polygon sides.

 

Example

 

Great circles:

 


 

 


Great circles after application of the generalized angle bisection method in some polygons.

Four facets are appearing.

 


 

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