全等角的定义

GeoGebra 命令及参数

1. Rotate(A, α, B) → A'
2. Angle(A, B, A') → β
3. Rotate(C, α, D) → C'
4. Angle(C, D, C') → γ
5. Rotate(E, α, F) → E'
6. Angle(E, F, E') → δ
7. Ray(B, A') → a
8. Ray(B, A) → b
9. Ray(F, E) → c
10. Ray(F, E') → d
11. Ray(D, C) → e
12. Ray(D, C') → f
13. Circle(B, 5.5) → g
14. Circle(F, 5.5) → h
15. Circle(D, 5.5) → k
16. Intersect(g, a) → G,
17. Intersect(g, b) → H,
18. Intersect(h, c) → I,
19. Intersect(h, d) → J,
20. Intersect(k, f) → K,
21. Intersect(k, e) → L,
22. Vector(B, H) → u
23. Vector(B, G) → v
24. Vector(F, I) → w
25. Vector(F, J) → i
26. Vector(D, L) → j
27. Vector(D, K) → l