✓ 1. What is the sum of its angle measures? 90° 180° 360°
✓ 2. Move vertex A to a different location. Which vertex angle remains unchanged? B C D
✓ 3. What is the sum of the angle measures of the quadrilateral? °
✓ 4. Move vertex B to a different location. What is the sum of the angle measures of the quadrilateral? °
✓ 5. Move vertices C and D to different locations. What is the sum of the angle measures of the quadrilateral? °
✓ 6. Move each vertex one more time to a different location. What is the sum of the angle measures of the quadrilateral? °
✓ 7. Make a conjecture. What is the sum of the angle measures of any quadrilateral? °