圆周角定理演示 by Arthur Lee

GeoGebra 命令及参数

1. Circle(A, B) → c
2. Point(c) → C
3. Point(c) → D
4. Point(c) → E
5. Segment(C, E) → a
6. Segment(E, D) → b
7. AngularBisector(C, E, D) → d
8. Intersect(c, d, 2) → F
9. CircumcircleArc(C, F, D) → e
10. Angle(C, E, D) → β
11. Ray(E, C) → f
12. Ray(E, D) → g
13. Ray(C, G) → h
14. Segment(G, D) → i
15. Intersect(c, h, 2) → H
16. Segment(H, D) → j
17. Segment(C, H) → l
18. Segment(C, G) → k
19. Polygon(G, H, D) → poly1, d_1, g_1, h_1
20. Angle(C, G, D) → θ
21. Angle(C, H, D) → γ
22. Angle(H, D, G) → α