对称线与折叠

GeoGebra 命令及参数

1. Polygon(A, B, 4) → poly1, f, g, h, i, C, D
2. LineBisector(D, A) → AD
3. LineBisector(A, B) → AC
4. LineBisector(D, B) → AB
5. LineBisector(C, A) → BD
6. Segment(E, F) → n
7. Line(E, F) → studentline
8. Mirror(D, n) → D'
9. Mirror(C, n) → C'
10. Intersect(i, n) → G
11. Intersect(g, n) → H
12. Polygon(D', G, H, C') → poly2, d', g_1, h_1, c'
13. Polygon(A, G, H, B) → poly3, a, g_2, h_2, b
14. Intersect(n, h) → I
15. Polygon(I, C', H) → poly4, h_3, i_1, c'_1
16. Polygon(I, D, A, B, H) → poly5, i_2, d, a_1, b_1, h_4
17. Polygon(G, D', I) → poly6, i_3, g_3, d'_1
18. Polygon(G, A, B, C, I) → poly7, g_4, a_2, b_2, c, i_4
19. Polygon(A, D, C, B) → poly8, a_3, d_1, c_1, b_3
20. Intersect(n, f) → J
21. Mirror(A, n) → A'
22. Polygon(J, A', D', C', H) → poly9, j, a', d'_2, c'_2, h_5
23. Mirror(B, n) → B'
24. Polygon(D', G, J, B', C') → poly10, d'_3, g_5, j_1, b', c'_3
25. Polygon(G, A, J) → poly11, j_2, g_6, a_4
26. Polygon(J, H, B) → poly12, b_4, j_3, h_6