# Dynamic Geometry 1451: Orthopole of a Line

If perpendiculars
AA', BB', and CC' are dropped to any line L from the vertices of a triangle
ABC, then the perpendiculars A'A''. B'B'', and C'C'' to the opposite sides
BC, AC, and AB, respectively, are concurrent at a point P called the orthopole
of the line L and triangle ABC.

## Static Diagram of the Orthopole of a Line

## Step-by-step diagrams after exporting from GeoGebra

## Poster of the Orthopole of a Line 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 points
or figures.

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