Home Geometry Problems Angle Bisector 121-130  View or post a solution 
Problem 126. Incenter of a Triangle, Angle Bisector, Proportions.
Level: High School, College, SAT Prep.

In the figure below, given a triangle ABC of sides AB = c, BC = a, and AC = b. Let be BD the angle bisector of B, I the incenter, BI = e and ID =d. Prove that: To prove formula. View or post a solution. 

Problem Incenter, Angle Bisector

Illustration using iPad Apps.

Problem Incenter, Angle Bisector using iPad Apps

See: Euclid's Elements Book VI, Proposition 3: Angle Bisector Theorem.

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