相似三角形判定与角度构造（GeoGebra）

GeoGebra 命令及参数

1. Point(Circle[B, side1length]) → C
2. Circle(B, side2length) → c
3. Circle(C, side3length) → d
4. Intersect(c, d, 1) → A
5. Segment(B, A) → b
6. Segment(C, A) → a
7. Segment(B, C) → e_1
8. Angle(C, B, A) → α
9. Point(Circle[E, triangle2side2length]) → F
10. Segment(E, F) → f
11. Rotate(F, α, E) → Y
12. Angle(F, E, Y) → β
13. Ray(E, Y) → g
14. Angle(A, C, B) → γ
15. Rotate(E, (-γ), F) → X
16. Angle(X, F, E) → δ
17. Ray(F, X) → h
18. Intersect(g, h) → D
19. Circle(D, b) → k
20. Circle(D, a) → p
21. Circle(D, a) → q
22. Intersect(q, h, 1) → Q
23. Circle(D, b) → r
24. Intersect(r, g, 1) → P
25. Segment(P, Q) → i
26. Segment(E, D) → l
27. Segment(D, F) → m
28. Angle(B, A, C) → ε
29. Segment(P, Q) → e
30. Distance(A, B) → distanceAB
31. Distance(B, C) → distanceBC
32. Distance(A, C) → distanceAC
33. Distance(D, E) → distanceDE
34. Distance(E, F) → distanceEF
35. Distance(D, F) → distanceDF
36. Polygon(B, C, A) → t1, a_1, b_1, c_1
37. Polygon(P, Q, D) → t2, d_1, p_1, q_1
38. Polygon(E, F, D) → t3, d_2, e_2, f_1
39. Angle(E, D, F) → ζ