相似三角形（缩放）

GeoGebra 命令及参数

1. Rotate(A, α, B) → A'
2. Angle(A, B, A') → β
3. Line(A', B) → a
4. Line(B, A) → b
5. Point(a) → C
6. Segment(B, C) → d
7. Segment(B, A) → e
8. Polygon(C, B, A) → poly1, a_1, c_1, b_1
9. Point(Circle[D, abs(q)]) → E
10. Segment(D, E) → c
11. Rotate(E, α, D) → E'
12. Angle(E, D, E') → γ
13. Line(D, E') → f
14. Point(Circle[D, abs(p)]) → F
15. Segment(D, F) → g
16. Circle(D, F) → h
17. Intersect(h, f, 2) → G
18. Polygon(G, D, E) → poly2, e_1, g_1, d_1
19. Angle(B, C, A) → δ
20. Angle(D, G, E) → ε
21. Angle(G, E, D) → ζ
22. Angle(C, A, B) → η