费马-托里拆利点（第二版）：三角形内到三顶点距离和最小的点

GeoGebra 命令及参数

1. Segment(A, B) → f
2. Polygon(A, C, B) → t1, b, a, c
3. Polygon(A, C, 3) → poly1, g, h, i, D
4. Polygon(C, B, 3) → poly2, j, k, l, E
5. Segment(D, B) → m
6. Segment(E, A) → n
7. Polygon(B, A, 3) → poly3, p, q, r, F_{1}
8. Segment(F_{1}, C) → s
9. Intersect(n, m) → G
10. Intersect(m, n) → H
11. Intersect(n, m) → I
12. Intersect(m, n) → F_{2}
13. Segment(A, C) → t
14. Segment(C, B) → d
15. Point(s) → F
16. Segment(A, F) → e
17. Segment(B, F) → f_1
18. Segment(F, C) → g_1
19. Intersect(s, f) → K
20. Segment(F, K) → h_1
21. Angle(B, A, F) → γ
22. Angle(F, B, A) → δ
23. Angle(B, F, C) → α
24. Angle(C, F, A) → β
25. Angle(A, F, B) → η