Online Geometry Problem 656: Triangle, Cevian, Concurrency. Level: High School, Honors Geometry, College, Mathematics Education

The figure shows a triangle ABC with the cevians AD, BE, and CF concurrent at G. Triangle DEF has the cevians DP, EQ, and FR concurrent at S. Prove that lines AP, BQ, and CR are concurrent at T.
This entry contributed by Mohak Jain.