平行线中的角

GeoGebra 命令及参数

1. Line(A, B) → f
2. Line(A, C) → g
3. Point(f) → D
4. Point(g) → E
5. CircleSector(A, D, E) → c
6. Point(g) → F
7. Point(f) → G
8. CircleSector(A, F, G) → d
9. Mirror(d, A) → d'
10. Mirror(c, A) → c'
11. Dilate(C, a, A) → C'
12. Line(C', f) → h
13. Vector(A, C') → u
14. Translate(d, u) → d'_{1}
15. Translate(c, u) → c'_{1}
16. Translate(d', u) → d''
17. Translate(c', u) → c''