Dao's theorem on six circumcenters

Nikolaos Dergiades, Dao's theorem on six circumcenters associated with a cyclic hexagon, Forum Geometricorum, 14 (2014) 243--246. Abstract. We reformulate and give an elegant proof of a wonderful theorem of Dao Thanh Oai concerning the centers of the circumcircles of the six triangles each bounded by the lines containing three consecutive sides of the hexagon. http://forumgeom.fau.edu/FG2014volume14/FG201424.pdf http://forumgeom.fau.edu/FG2014volume14/FG201429.pdf

 

Đào Thanh Oai

 
Material Type
Activity
Tags
geometry  theorem  circle  problem  concurrent  new 
Target Group (Age)
19+
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English (United Kingdom)
 
 
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