The dynamic figure below shows a scalene triangle ABC, angle B = 60 degrees, I is the incenter , D midpoint of BC and E midpoint of AB. DI extended intersects BA or extension at M and EI extended intersects BC or extension at N. Prove that AN is parallel to MC.
This step-by-step interactive illustration was created with GeoGebra.
GeoGebra is free and multi-platform dynamic mathematics software for all levels of education that joins geometry, algebra, tables, graphing, statistics and calculus application, intended for teachers and students. Many parts of GeoGebra have been ported to HTML5.
Ten problems 891-900
HTML5 and Dynamic Geometry
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