Investigating the Exterior Angles of a Triangle.[br][br]1. Drag any of the vertices of the triangle around on the screen. What do you observe about the interior angles?[br]2. Create acute, obtuse and right triangle?[br]3. Record the measurements of the adjacent angles at point C.[br]4. What do you observe about the adjacent angles at point C?[br]5. Write a general equation about the adjacent angles at point C.[br]6. Record the measurements of marked exterior angle and the other interior angles.[br]7. What do you notice the relationship with the marked exterior angle and the other interior angles?[br]8. Write a general equation about the marked exterior angle and the other interior angles.