Problem 376: Triangle, Excenter, Internal and External Angle Bisectors

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The figure shows a triangle ABC with the excenter E (point of intersection of one of the internal angle bisectors and two of the external angle bisectors). Prove that Internal and External Angle Bisectors, Formula to prove. Post a comment.
 

Internal and External Angle bisector
 

See Also:

 

Classical Theorems

 

Geometry Jobs

 

Triangle, Altitude, Angle bisector

Proposed Problem 377.
Triangle, Internal Angle Bisector, Altitude.
 

Triangle, Excenter, Angle

Proposed Problem 375.
Triangle, Excenter, External Angle Bisectors.
 

Tiangle, Incenter, Angle

Proposed Problem 374.
Triangle, Incenter, Internal Angle Bisectors.

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