用GeoGebra构造最小包围三角形的方框

GeoGebra 命令及参数

1. Polygon(A, B, C) → poly1, c, a, b
2. Sort({a, b, c}) → list1
3. Intersect(Element[list1, 1], Element[list1, 2]) → D_1
4. Intersect(Element[list1, 2], Element[list1, 3]) → E_1
5. Intersect(Element[list1, 3], Element[list1, 1]) → F_1
6. Midpoint(F_1, E_1) → G
7. Circle(G, E_1) → d_1
8. LineBisector(E_1, F_1) → e_2
9. Intersect(d_1, e_2) → H, I
10. Polygon(F_1, I, E_1, H) → poly2, f_1, i, e_1, h
11. If(IsInRegion[D_1, poly2], H, D_1) → J
12. Segment(E_1, F_1) → g_1
13. Circle(J, g_1) → k
14. OrthogonalLine(J, g_1) → j
15. Intersect(j, g_1) → K
16. Ray(J, K) → l
17. Intersect(k, l) → L,
18. Line(E_1, L) → m
19. Intersect(d_1, m, 2) → D
20. Line(F_1, D) → n
21. OrthogonalLine(E_1, m) → p
22. OrthogonalLine(J, n) → q
23. Intersect(n, q) → E
24. Intersect(p, q) → F
25. Polygon(E_1, D, E, F) → poly3, d, e, f, g