14.2: Geometry
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1. Obtuse
2. Right
3. Right
4. Angle COE ∼ Angle AOB ∼40∼130∼140
5. 44
6. 23
7. 72
8. 6
9. 40∼112
10. 98
11. 19.1
12. √168
13. 42
14. 74
15. 212
16. 31.42 or 31.4
17. 62.83 or 62.8
18. 432
19. 50∼ square cm
20. 2200
21. 44∼ square meters
22. 113.1 or 113.04
23. 40.8 or 40.80
24. acb
25. 615.8∼ cubic feet
26. 254.5∼ cubic feet
27. 9202.77∼ cubic cm