圆与角度的比较：中心角与圆周角

GeoGebra 命令及参数

1. Circle(A, 3) → c
2. Point(c) → D
3. Point(c) → C
4. Point(c) → B
5. Angle(D, C, B) → η
6. Segment(B, C) → a
7. Segment(D, C) → b
8. AngularBisector(a, b) → q, r
9. Intersect(c, q) → K, L
10. Angle(D, A, L) → ζ
11. Angle(L, A, B) → ε
12. Circle(E, 3) → d
13. Point(d) → F
14. Point(d) → G
15. Segment(F, G) → g
16. Point(d) → H
17. Segment(G, H) → h
18. AngularBisector(g, h) → l, m
19. Intersect(d, m) → I, J
20. Angle(J, E, H) → δ
21. Angle(F, E, J) → γ
22. Segment(B, A) → e
23. Segment(A, D) → f
24. Segment(F, E) → i
25. Segment(E, H) → j
26. Angle(F, E, H) → β
27. Angle(F, G, H) → α
28. Angle(D, A, B) → κ
29. Segment(E, J) → n
30. CircumcircleArc(F, J, H) → k
31. CircumcircleArc(D, L, B) → p