椭圆与平行四边形

GeoGebra 命令及参数

1. Segment(B, C) → b
2. Line(A, b) → c
3. Line(B, c) → i
4. Point(c) → J
5. OrthogonalLine(J, c) → f
6. Segment(A, B) → a
7. Line(C, a) → d
8. Intersect(c, d) → D
9. Midpoint(A, B) → E
10. Midpoint(B, C) → F
11. Midpoint(D, C) → G
12. Midpoint(D, A) → H
13. Conic(I, E, F, G, H) → e
14. Circle(J, Segment[A, B]) → g
15. Circle(J, Segment[A, D]) → h
16. Intersect(h, c, 2) → K
17. OrthogonalLine(K, c) → j
18. Intersect(i, j) → L
19. Midpoint(J, K) → O
20. Midpoint(K, L) → P
21. Intersect(i, f) → M
22. Midpoint(J, M) → N
23. Midpoint(L, M) → Q
24. Midpoint(Q, O) → R
25. Line(R, If[Distance[Q, R] ≤ Distance[N, R], N, Q]) → k
26. Circle(R, cdist) → p
27. Intersect(p, k, 2) → S
28. Intersect(p, k, 1) → T
29. Ellipse(S, T, Q) → q
30. Midpoint(H, F) → U