Four cyclically touching circles.

The proof for general case I've found by myself. Is it already known ?
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Denis —

 
Resource Type
Activity
Tags
circles  exploration  tangent  tangent-line  theorem  touching 
Target Group (Age)
15 – 18
Language
English (United States)
 
 
GeoGebra version
4.0
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1742
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License
CC-BY-SA, GeoGebra Terms of Use
 
 
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