三角形与多边形的外角和

GeoGebra 命令及参数

1. Rotate(A, (b * π / 180), B) → A'
2. Angle(A, B, A') → α
3. Ray(B, A) → f
4. Ray(B, A') → g
5. Point(g) → C
6. Segment(C, A) → h
7. Segment(B, C) → i
8. Segment(B, A) → j
9. Min({j, i, h}) → c
10. Ray(C, A) → k
11. Ray(A, B) → l
12. Circle(B, (0.2 * c)) → d
13. Circle(A, (0.2 * c)) → e
14. Circle(C, (0.2 * c)) → p
15. Intersect(e, l, 1) → D
16. Intersect(e, k, 2) → E
17. Intersect(d, l, 2) → F
18. Intersect(g, i) → G
19. Intersect(g, i) → H
20. Intersect(d, g, 1) → I
21. Intersect(p, k) → J,
22. Intersect(p, g) → K, L
23. CircleSector(B, I, F) → q
24. CircleSector(C, J, L) → r
25. CircleSector(A, D, E) → s
26. Polygon(B, A, C) → poly1, c_1, b_1, a_1
27. Dilate(A, If[0 < a ≤ 1, 1 - a, 0], B) → A'_1
28. Vector(A, A'_1) → u
29. Dilate(B, If[1 < a ≤ 2, 2 - a, 0], C) → B'
30. Vector(B, B') → v
31. Translate(q, v) → q'
32. Translate(s, u) → s'
33. Translate(s', v) → s''
34. Translate(q, v) → q'_1
35. CircleArc(A, D, E) → t
36. CircleArc(B, I, F) → d_1