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In differential geometry , Fenchel 's theorem ( Werner Fenchel , 1929 ) states that the average curvature of any closed convex plane curve is where P is the perimeter .
 person: Fenchel; person: Werner Fenchel
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Fenchel, Werner Fenchel 
Answer:
 person: Fenchel; person: Werner Fenchel