Drag the blue vertices from the triangle around to see how the angle value changes, noting the right, acute, and obtuse names. On the quadrilateral, drag the vertices around to discover how the angle values change compared to the value of the triangle.
1. What is the value when the angle is obtuse? 2. What is the value when the angle is acute? 3. What is the value when the angle is right? 4. How do the angles on the triangle compare to the angles on the quadrilateral? 5. Can you make all of the angles on the quadrilateral right? Acute? Obtuse?