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Tool: Constructing the orthocenter of a triangle. Math Open Refrence.
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Go to: http://www.mathopenref.com/constorthocenter.html (opens a new window)
Description:

An interactive applet and associated web page that provide step-by-step instructions on how to construct the orthocenter of a triangle using only a compass and straightedge. The method used involves constructing two altitudes of the triangle, which intersect at the orthocenter.

The animation can be run either continuously like a video, or single stepped to allow classroom discussion and thought between steps.

Applet can be enlarged to full screen size for use with a classroom projector. 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: Java Applet 
Author:
Language: English 
Cost: Does not require payment for use

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Courses: Geometry Centers of triangles, Straightedge and compass