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Triangles - Property of the Concave Quadrilateral - the boomerang Solved Problem of Geometry . Congruent triangles Solved Problem of geometry at UNI level - mathematics . Solutions of the entrance test to the National University of Engineering UNI - second evaluation - Mathematics Solution . Professor Jorge Ayala solves a question from the entrance exam to the university at the pre-university level at the Rubiños Academy . Pre-university and secondary school class presented at the Rubiños pre-university academy.