经典奶牛放牧几何作图：圆弧与最短周界

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → C
2. Polygon(C, A, D, B) → q1, c, a, d, b
3. Circle(C, string) → e
4. Circle(C, b) → f
5. Circle(C, string + 1) → h
6. Intersect(h, yAxis, 2) → E
7. Circle(D, string - m - n) → q
8. Circle(A, string - m) → c_1
9. Intersect(e, xAxis, 2) → M
10. Ray(A, D) → i_1
11. Intersect(c_1, i_1) → N,
12. CircleArc(A, M, N) → d_1
13. Point(d_1) → O
14. Rotate(N, π / 2, D) → N'
15. CircleArc(D, N, N') → e_1
16. Intersect(e, yAxis, 2) → F
17. CircleArc(C, F, M) → g
18. Circle(B, string - n) → k
19. Ray(B, D) → l
20. Intersect(k, l, 1) → I
21. CircleArc(B, I, F) → p
22. Circle(D, string - m - n) → t
23. Ray(D, A) → f_1
24. Intersect(t, f_1, 1) → K
25. CircleArc(D, K, I) → g_1
26. CircleArc(A, C, K) → p_1
27. Point(p_1) → H
28. Rotate((string, 0), If[0 ≤ o ≤ 3, ((-o) * π / 2), ((-3 * π)) / 2], (0, 0)) → Q
29. Rotate(I, If[4 < o ≤ 5, ((-(o - 4)) * π / 2), (-(π / 2))], D) → I'
30. Rotate(K, If[5 < o ≤ 6, ((-(o - 5)) * π / 2), (-(π / 2))], A) → K'
31. Rotate(M, If[-1 < o ≤ 0, ((-o) * π / 2), π / 2], A) → M'
32. Rotate(N, If[-2 < o ≤ -1, (abs(o + 1) * π / 2), π / 2], D) → N'_{1}
33. Segment(C, Q) → i
34. Segment(C, B) → j
35. Rotate(N', If[-3 < o ≤ -2, (abs(o + 2) * π / 2), π / 2], (0, n)) → N''
36. Rotate((0, string), If[3 < o ≤ 4, ((-(o - 3)) * π / 2), (-(π / 2))], (0, n)) → G
37. Segment(B, G) → r
38. Segment(A, M') → s
39. Point(s) → J
40. Segment(C, J) → h_1
41. Segment(D, I') → j_1
42. Segment(B, D) → k_1
43. Segment(A, D) → l_1
44. Point(h_1) → L
45. Segment(L, M) → m_1
46. Intersect(j, r) → P
47. Segment(P, I) → n_1
48. Segment(D, N'_{1}) → q_1