对称中线点：三角形几何中的重要概念

GeoGebra 命令及参数

1. Segment(A, B) → a
2. Segment(B, C) → b
3. Segment(C, A) → c
4. AngularBisector(A, B, C) → d
5. AngularBisector(C, A, B) → e
6. AngularBisector(B, C, A) → f
7. OrthogonalLine(B, d) → l
8. OrthogonalLine(A, e) → m
9. OrthogonalLine(C, f) → a_1
10. Polygon(A, C, 4) → poly1, g, h, i, j, D, E
11. Polygon(C, B, 4) → poly2, k, n, p, q, F, J
12. Polygon(B, A, 4) → poly3, r, s, t, b_1, H, I
13. Line(I, H) → c_1
14. Line(E, D) → d_1
15. Line(J, F) → e_1
16. Midpoint(b) → J_1
17. Midpoint(c) → P
18. Midpoint(a) → L
19. Segment(A, J_1) → f_1
20. Segment(L, C) → g_1
21. Segment(P, B) → h_1
22. Intersect(f_1, g_1) → G
23. Intersect(c_1, d_1) → M
24. Intersect(c_1, e_1) → N
25. Intersect(d_1, e_1) → O
26. Line(M, A) → i_1
27. Line(N, B) → j_1
28. Line(O, C) → k_1
29. Intersect(i_1, j_1) → K