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Tool: Euler line - Math Open Reference
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Go to: http://www.mathopenref.com/eulerline.html (opens a new window)
Description:

An interactive applet and associated web page that describe the Euler line. It shows a triangle whose vertices can be dragged. As you drag them, the centroid, circumcenter and orthocenter move appropriately, showing that they are always collinear, always lying on the Euler line.

There are controls to individually turn on the construction lines for each center. This helps visualize the concept since if they are all drawn at once, the diagram would be hopelessly confused.

The web page has a full description the Euler line and has links to separate pages which go into each center in depth.

Applet can be enlarged to full screen size for use with a classroom projector. Diagram can be printed. After use in the classroom, student can access it again from any web browser at home or in the library with no login required.

This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Technology Type: Computer 
Author: John Page
Language: English 
Cost: Does not require payment for use

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Courses: Geometry Line, Centers of triangles