完全四边形与圆的构造

GeoGebra 命令及参数

1. Line(D, A) → f
2. Line(A, C) → g
3. Line(C, B) → h
4. Line(B, A) → i
5. Line(D, C) → j
6. Line(D, B) → k
7. Intersect(f, h) → I_{AD∧BC}
8. Intersect(k, g) → I_{AC∧BD}
9. Intersect(j, i) → I_{AB∧CD}
10. Segment(A, B) → r
11. Segment(A, I_{AC∧BD}) → n
12. Segment(B, I_{AD∧BC}) → p
13. Midpoint(A, D) → M_{AD}
14. Midpoint(D, B) → M_{BD}
15. Midpoint(C, D) → M_{CD}
16. Midpoint(A, B) → M_{AB}
17. Midpoint(A, C) → M_{AC}
18. Midpoint(C, B) → M_{BC}
19. Segment(D, B) → m
20. Segment(B, I_{AC∧BD}) → s
21. Segment(D, A) → l
22. Segment(D, C) → q
23. Segment(C, I_{AB∧CD}) → a
24. Circle(I_{AD∧BC}, M_{AD}, M_{BC}) → c
25. Circle(I_{AC∧BD}, M_{BD}, M_{AC}) → d
26. Circle(I_{AB∧CD}, M_{AB}, M_{CD}) → e
27. Segment(I_{AC∧BD}, C) → b
28. Segment(C, I_{AD∧BC}) → f_1
29. Segment(A, I_{AB∧CD}) → t
30. Segment(A, I_{AD∧BC}) → h_1
31. Conic(M_{BD}, M_{BC}, M_{AC}, M_{AD}, I_{AB∧CD}) → p9
32. Intersect(d, c) → I_{dc}1, I_{dc}2, ,
33. Line(I_{dc}1, I_{dc}2) → Rx_{dc}
34. Intersect(e, c) → I_{ec}1, I_{ec}2, ,
35. Line(I_{ec}1, I_{ec}2) → Rx_{ec}
36. Intersect(e, d) → I_{ed}1, I_{ed}2, ,
37. Line(I_{ed}2, I_{ed}1) → Rx_{ed}
38. Intersect(Rx_{ed}, Rx_{dc}) → Rc