Four incenter lie on a circle

Let ABCD be a tangential qadrilateral, J is intersection of two perpendicular of AC,BD. Then four incenter of four triangles AJB,BJC,CJD,DJA lie on a circle

 

Đào Thanh Oai

 
Material Type
Activity
Tags
four  incenter  pependicular  intersection  concyclich  cyclic  quadrilateral 
Target Group (Age)
19+
Language
English (United Kingdom)
 
 
GeoGebra version
4.4
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811
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