角度加法定理

GeoGebra 命令及参数

1. Ray(A, B) → f
2. Ray(A, C) → g
3. Point(g) → D
4. Point(f) → E
5. OrthogonalLine(D, g) → h
6. OrthogonalLine(E, f) → i
7. Intersect(h, i) → F
8. Segment(A, E) → j
9. Segment(F, E) → k
10. Segment(F, D) → l
11. Segment(D, A) → m
12. Point(k) → G
13. Segment(D, G) → n
14. OrthogonalLine(G, n) → p
15. Intersect(p, j) → H
16. Segment(H, D) → q
17. Polygon(D, G, H) → poly1, h_1, d, g_1
18. Angle(D, G, H) → α
19. AngularBisector(H, D, G) → r
20. Point(r) → J
21. AngularBisector(F, D, G) → s
22. Point(s) → K
23. AngularBisector(D, H, A) → t
24. Point(t) → L
25. Polygon(D, G, F) → poly2, f_1, d_1, g_2
26. Polygon(H, E, G) → poly3, g_3, h_2, e
27. Polygon(A, H, D) → poly4, d_2, a, h_3
28. RotateText(text5, Angle[E, H, G]) → text6
29. RotateText(text7, Angle[F, D, G]) → text8
30. RotateText(text14, 90°) → text15
31. AngularBisector(H, G, E) → b
32. Point(b) → U
33. Vector(V, W) → u
34. Vector(W, V) → v
35. Vector(Z, A_1) → w
36. Vector(A_1, Z) → c