
Problem 127.
Triangle, Centroid, Incenter, Parallel, Proportions.
Level: High School, SAT Prep, College 
In the figure below, given a triangle
ABC of sides AB = c, BC = a, and c > a. Let be I the incenter
and G the centroid. If GI is parallel to AC, prove that:
.
View or post a solution.

Geometric Art using iPad Apps
See also:
Problem 126. Augmented
reality. 
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