Exterior Angles of a Triangle

You have already learned where the exterior and interior angles of a triangle are located. Now you want to see what special properties the exterior angles have. See what relationships you can find between the interior angles of the triangle and exterior angle BAD. Find as many properties as possible. Once you find a property see if it works for all the exterior angles of triangle ABC. Please record the properties that you find so that we can discuss them later.

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)

Jackie Southard, June 24, 2008, Created with GeoGebra