This is a simple demonstration of similar triangles. Grab a vertex and play; the triangles remain similar. Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and active in your browser (Click here to install Java now)

This is a more detailed demonstration of similar triangles. As before, grab a vertex and play; the triangles remain similar. But in this case we have four similar trianges, one original, one similar via AA, one by SSS~, and one by SAS~. Colored angles of like color are congruent. Colored segments of like color are proportional within the same triangle. Play with the original and each similar triangle to see what changes and what stays the same. Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and active in your browser (Click here to install Java now)