Geometry Problems, Online Education

Problem 96. Similar Triangles, Incenters, Parallelogram. High School, College

In the figure below, given a triangle ABC, line DEF parallel to AC and line FGM parallel to AB. If O, O1, O2, and O3, are the incenters of triangles ABC, DBE, FGE, and MGC respectively, prove that the quadrilateral OO1O2O3 is a parallelogram.
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Elearning problem 96

  


FACTS AND HINTS:

1. SIMILAR TRIANGLES:
Proposition: Corresponding angles of similar triangles are congruent.
 

2. PROVING THAT LINES ARE PARALLEL:
Proposition: Two lines are parallel if a pair of corresponding angles are congruent.
Proposition: Two lines are parallel if a pair of alternate interior angles are congruent.

  

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