三角形の中央＝フェルマー点

GeoGebra Commands & Parameters

1. Segment(A, B) → f
2. Segment(B, C) → g
3. Segment(C, A) → h
4. Polygon(A, C, 3) → poly1, i, j, k, D
5. Angle(A, D, C) → γ
6. Polygon(B, A, 3) → poly2, l, m, n, E
7. Polygon(C, B, 3) → poly3, p, q, r, F
8. Circle(A, C, D) → c
9. Circle(C, B, F) → d
10. Circle(B, E, A) → e
11. Intersect(c, d) → G, M, ,
12. Segment(A, H) → s
13. Segment(H, B) → t
14. Segment(H, C) → a
15. Segment(B, M) → f_1
16. Segment(M, A) → g_1
17. Segment(M, C) → h_1
18. Angle(B, M, C) → α
19. Polygon(M, B, 3) → poly4, i_1, j_1, k_1, I
20. Segment(I, F) → l_1
21. Angle(B, I, F) → β
22. Polygon(H, B, 3) → poly5, m_1, n_1, p_1, J
23. Segment(J, F) → q_1