Explanation:
9. x°=90°-30°=60°
10. x°=180°-(40°+65°)=180°-105°=75°
11. x°=180°-(35°+45°)=180°-80°=100°
12. x°=180°-(25°+x°+65°)
x°=180°-90°-x°
2x°=90°
x°=45°; (x+65)°=110°
13. x°=180°-(48°+x°-44°)
x°=180°-4°-x°
2x°=176°
x°=88°; (x-44)°=44°
14. x°=180°-(73°+x°-11°)
x°=180°-62°-x°
2x°=118°
x°=59°; (x-11)°=48°