圆周角与切线-弦角关系研究

GeoGebra 命令及参数

1. Circle(A, B) → c
2. Point(c) → C
3. Point(c) → D
4. CircleArc(A, C, D) → d
5. CircleArc(A, D, C) → e
6. Point(e) → E
7. Point(d) → F
8. Segment(C, D) → a
9. Segment(D, E) → b
10. Segment(D, F) → f
11. AngularBisector(C, D, E) → g
12. AngularBisector(C, D, F) → h
13. Intersect(e, g) → G, H
14. Intersect(d, h) → I, J
15. CircumcircleArc(E, H, C) → k
16. CircumcircleArc(C, J, F) → p
17. Rotate(A, 270*°, D) → A'
18. Ray(D, A') → i
19. Rotate(A, 90*°, D) → A'_1
20. Ray(D, A'_1) → j
21. Ray(D, E) → l
22. Ray(D, F) → m
23. Circle(D, 2) → q
24. Intersect(q, l) → K,
25. Intersect(q, m) → L,
26. Angle(C, D, K) → α
27. Angle(C, D, L) → β
28. Angle(A', E, C) → γ
29. Angle(C, F, A'_1) → δ