信封折叠

GeoGebra 命令及参数

1. Midpoint(B, C) → E
2. Midpoint(D, A) → F
3. Segment(B, C) → f
4. Segment(C, A) → g
5. Segment(A, D) → h
6. Segment(D, B) → i
7. Point(g) → G
8. Segment(F, G) → j
9. Line(E, j) → k
10. OrthogonalLine(G, xOyPlane) → l
11. Segment(G, E) → m
12. Line(F, m) → n
13. Intersect(k, i) → H
14. Segment(H, F) → p
15. Segment(H, E) → q
16. Rotate(D, a, p) → D'
17. Polygon(F, D', H) → t1, h_1, f_1, d'
18. Rotate(A, a, j) → A'
19. Polygon(F, G, A') → t2, a', f_2, g_1
20. Rotate(C, a, m) → C'
21. Rotate(B, (-a), q) → B'
22. Polygon(G, E, C') → t3, c', g_2, e
23. Polygon(B', H, E) → t4, e_1, b', h_2
24. Polygon(H, E, G, F) → q1, h_3, e_2, g_3, f_3