SAS相似三角形判定动态演示

GeoGebra 命令及参数

1. Circle(A, AB) → c
2. Circle(A, AC) → d
3. Point(c) → B
4. Rotate(B, (-α), A) → B'
5. Angle(B', A, B) → AngleA
6. Line(A, B) → a
7. Line(A, B') → b
8. Intersect(d, b, 2) → C
9. Polygon(B, A, C) → poly1, c_1, b_1, a_1
10. Angle(A, B, C) → γ
11. Angle(B, C, A) → δ
12. Circle(D, (AB * k)) → e
13. Circle(D, (AC * k)) → f
14. Point(e) → E
15. Rotate(E, (-α), D) → E'
16. Angle(E', D, E) → AngleD
17. Line(D, E) → g
18. Line(D, E') → h
19. Intersect(f, h, 2) → F
20. Polygon(E, D, F) → poly2, f_1, e_1, d_1
21. Angle(D, E, F) → β
22. Angle(B, C, A) → ε
23. Angle(E, F, D) → ζ
24. Segment(A, B) → i
25. Segment(D, E) → j
26. Segment(A, C) → l
27. Segment(D, F) → m
28. Segment(C, B) → n
29. Segment(F, E) → p