角度加法定理的视觉演示

GeoGebra 命令及参数

1. Ray(B, A) → a
2. Ray(B, C_1) → b
3. Ray(B, C) → c
4. Circle(B, E) → d
5. Intersect(d, a, 1) → F
6. Intersect(d, b, 1) → G
7. Intersect(d, c, 1) → H
8. CircleArc(B, F, G) → e
9. CircleArc(B, G, H) → f
10. Point(e) → K
11. Point(f) → L
12. Ray(B, K) → g
13. Ray(B, L) → h
14. Angle(F, B, K) → α
15. Angle(G, B, L) → β
16. CircleArc(B, F, K) → k
17. CircleArc(B, G, L) → p
18. CircleSector(B, F, K) → q
19. CircleSector(B, G, L) → r
20. CircleSector(B, G, L) → s
21. Point(g) → D
22. Point(b) → M
23. Point(a) → N
24. Distance(M, N) → distanceMN
25. Point(c) → O
26. Distance(O, M) → distanceOM
27. Circle(B, N) → t
28. Intersect(t, c, 1) → P
29. CircleArc(B, N, P) → c_1
30. Distance(Q, R) → distanceQR
31. Point(a) → Z
32. Point(c) → T
33. Textfield(i) → InputBox1
34. Textfield(γ) → InputBox2
35. Textfield(δ) → InputBox3
36. Textfield(ε) → InputBox4