多边形的外角 by ahmed

GeoGebra 命令及参数

1. Ray(A, B) → a
2. Ray(B, C) → b
3. Ray(C, A) → c
4. Dilate(B, d, A) → D
5. Dilate(C, d, A) → E
6. Ray(A, D) → e
7. Ray(D, E) → f
8. Polygon(A, E, D) → P, d_1, a_1, e_1
9. Point(f) → F
10. Point(b) → G
11. Point(c) → H
12. Angle(H, A, D) → α
13. Angle(B, D, E) → β
14. Angle(F, E, A) → γ
15. Point(f) → I
16. Point(e) → J
17. Angle(J, D, I) → δ
18. Ray(E, A) → g