Go Geometry Problem Problem 374: Triangle, Incenter, Internal Angle Bisectors

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The figure shows a triangle ABC with the incenter I (point of intersection of all the internal angle bisectors). Prove that Formula to prove. Post a comment.
 

Triangle, Internal angle bisectors
 

See Also:

 

Classical Theorems

 

Geometry Jobs

 

Triangle, Excenter, Angle

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

Problem about square and inscribed circle

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

Circles, Common tangent

Proposed Problem 372.
Circles, Common Internal and External Tangent, Angles.

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