# Dynamic Geometry Problem 894: Triangle, Angle, 60 degrees, Incenter, Midpoint, Parallel Lines. GeoGebra, Step-by-step Illustration

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.

## Static Diagram of Problem 894

## Poster of Problem 894 using iPad Apps

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Classroom Resource:

Interactive step-by-step animation using GeoGebra

This step-by-step interactive illustration was created with
GeoGebra.

- To explore (show / hide): click/tap a check box.
- To stop/play the animation: click/tap the icon in the lower left corner.
- To go to first step: click/tap the "Go to step 1" button.
- To manipulate the interactive figure: click/tap and drag the blue points
or figures.

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.

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