Record several sets of measurements in this chart.
What do you notice about the angle measures as the shape of the triangle changes?
1. What is the sum of the 3 interior angles?[br]2. What other angle pairs would you like to add together?[br]3. How is exterior [math]\angle BCD[/math] related to the other angles?[br]4. What is the sum of the 3 exterior angles (one at each vertex)?
Information: Interior & Exterior Angles of a Triangle