1. Shapes and Angle Rules 80 + ? = 18080 + 100 = 180

2. Shapes and Angle Rules ? + 50 = 180130 + 50 = 180

3. Shapes and Angle Rules 10 + ? + 50 = 18010 + 120 + 50 = 180

4. Shapes and Angle Rules 100 + 120 + ? = 360100 + 120 + 140 = 360

5. Shapes and Angle Rules 30 + 30 + ? + 140 = 360 30 + 30 + 160 + 140 = 360

6. Shapes and Angle Rules a = 180 - 25155 = 180 - 25

7. Shapes and Angle Rules c = 360 - 100 - 35225 = 360 - 100 - 35

8. Shapes and Angle Rules ? = 360 - 15 - 55290 = 360 - 15 - 55

9. Shapes and Angle Rules 180 - 15 - 20 - 5 = m180 - 15 - 20 - 5 = 140

10. Shapes and Angle Rules 360 - 25 - 75 - 5 = y360 - 25 - 75 - 5 = 255