多边形：凸与凹的动态演示

GeoGebra 命令及参数

1. Polygon(A, B, C) → poly1, c, a, b
2. PointIn(poly1) → D
3. PointIn(poly1) → E
4. Segment(D, E) → f
5. Polygon(C, B, F, A) → poly2, c_1, b_1, f_1, a_1
6. Segment(C, B) → g
7. Segment(B, F) → h
8. Segment(F, A) → i
9. Segment(A, C) → j
10. Angle(C, B, F) → α
11. Angle(B, F, A) → β
12. Angle(F, A, C) → γ
13. Angle(A, C, B) → δ
14. PointIn(poly2) → G
15. PointIn(poly2) → H
16. Segment(G, H) → k
17. Polygon(C, B, I, J, A) → poly3, c_2, b_2, i_1, j_1, a_2
18. Angle(C, B, I) → ε
19. Angle(B, I, J) → ζ
20. Angle(I, J, A) → η
21. Angle(J, A, C) → θ
22. Segment(C, B) → l
23. Segment(B, I) → m
24. Segment(I, J) → n
25. Segment(J, A) → p
26. Segment(A, C) → q
27. PointIn(poly3) → K
28. PointIn(poly3) → L
29. Segment(K, L) → r
30. Segment(C, B) → s
31. Segment(B, A) → t
32. Segment(A, C) → g_1