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

Dynamic Geometry Problem 894: Triangle, Angle, 60 degrees, Incenter, Midpoint, Parallel Lines. GeoGebra, HTML5 Animation, Step-by-step Illustration, iPad Apps


Poster of Problem 894 using iPad Apps

Static Geometry Problem 894: Triangle, Angle, 60 degrees, Incenter, Midpoint, Parallel Lines. HTML5 Animation, Using GeoGebra, iPad Apps

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.

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