ACCESS - Exterior Angles
View the triangle. Can you see the relationship between the exterior angle to a given angle in a triangle and the other angles in a triangle? Let's see if we can help. 1. Use the slider to rotate the triangle 180 degrees. 2. Now, use the red point below to translate the triangle over and line up the blue points. 3. How are the angles not adjacent to the exterior angle (green and purple) related to the exterior angle? 4. Use the red point to change the angle of the triangle and see if this is true for all triangles. 5. Write an equation for the relationship between the non-adjacent interior angles of a triangle and the exterior angle.