Go Geometry Problem Problem 375: Triangle, Excenter, 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 External angle bisectors, formula to prove. Post a comment.
 

Triangle, Excenter, External angle bisectors
 

See Also:

 

Classical Theorems

 

Geometry Jobs

 

Triangle, Excenter, Internal and External angle bisector,

Proposed Problem 376.
Triangle, Excenter, Internal and External Angle Bisectors.
 

Tiangle, Incenter, Angle

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

Problem about square and inscribed circle

Proposed Problem 373.
Square, Inscribed Circle, Diagonal, Perpendicular, Angle.

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