重心的共轭点是垂足点

GeoGebra 命令及参数

1. Line(A, B) → a
2. Line(B, C) → b
3. Line(C, A) → c
4. Midpoint(B, A) → D
5. Midpoint(A, C) → E
6. Midpoint(C, B) → F
7. Segment(A, F) → d
8. Segment(D, C) → e
9. Segment(E, B) → f
10. Intersect(d, e) → G
11. Mirror(G, c) → G'_3
12. Mirror(G, a) → G'_1
13. Mirror(G, b) → G'_2
14. Circle(G'_1, G'_3, G'_2) → g
15. Center(g) → K
16. Ray(A, K) → h
17. Angle(G, A, E) → α
18. Angle(B, A, K) → β
19. Polygon(A, C, 4) → poly1, i, j, k, l, H, I
20. Polygon(C, B, 4) → poly2, m, n, p, q, J, L
21. Polygon(B, A, 4) → poly3, r, s, t, a_1, M, N
22. Line(N, M) → b_1
23. Line(I, H) → c_1
24. Line(L, J) → d_1
25. Intersect(b_1, c_1) → O
26. Intersect(b_1, d_1) → P
27. Intersect(c_1, d_1) → Q
28. Line(O, A) → e_1
29. Line(P, B) → f_1
30. Line(C, Q) → g_1