三角形折叠：几何作图与变换

GeoGebra 命令及参数

1. Polygon(A, B, C) → t1, c, a, b
2. PointIn(t1) → A1
3. LineBisector(A, A1) → f
4. Intersect(f, c) → E
5. Intersect(f, b) → F
6. OrthogonalLine(E, a) → g
7. OrthogonalLine(F, a) → h
8. Mirror(B, g) → B'
9. Mirror(C, h) → C'
10. Segment(B, B') → i
11. Point(i) → B1
12. Segment(C', C) → j
13. Point(j) → C1
14. Polygon(E, F, A1) → t2, a1, e, f_1
15. LineBisector(B, B1) → k
16. Intersect(k, c) → D
17. LineBisector(C1, C) → l
18. Intersect(l, b) → G
19. Intersect(k, a) → H
20. Intersect(l, a) → I
21. Polygon(D, B1, H) → t3, h_1, d, b1
22. Polygon(I, C1, G) → t4, g_1, i_1, c1
23. Polygon(A1, E, B1, C1, F) → poly1, m, n, p, s, t
24. Polygon(E, D, B1) → t5, q, e_1, d_1
25. Polygon(F, G, C1) → t6, r, f_2, g_2
26. Polygon(A, B, C) → t7, c_1, a_1, b_1
27. Distance(A, A1) → u