12. Classify the following angle: 150°
a. acute c. right
b. obtuse d. straight
13. Classify the following angle: 95°
a. acute c. obtuse
b. right d. straight
14. Classify the following angle: 180°
a. acute c. obtuse
b. right d. straight
15. Classify the following angle: 23°
a. acute c. obtuse
b. right d. straight