分类与绘制四边形

GeoGebra 命令及参数

1. Segment(A, B) → a_2
2. OrthogonalLine(B, a_2) → b_2
3. OrthogonalLine(B, a_2) → c_2
4. Point(b_2) → C
5. OrthogonalLine(C, b_2) → d_2
6. OrthogonalLine(A, a_2) → e_2
7. Intersect(d_2, e_2) → D
8. OrthogonalLine(D, d_2) → f_2
9. Polygon(A, B, C, D) → poly1, a_1, b_1, c_1, d_1
10. Angle(poly1) → a, b, c, d
11. Line(E, F) → g_2
12. OrthogonalLine(F, g_2) → h_2
13. OrthogonalLine(F, h_2) → i_2
14. Point(h_2) → G
15. OrthogonalLine(G, h_2) → j_2
16. OrthogonalLine(E, g_2) → k_2
17. Intersect(j_2, k_2) → H
18. OrthogonalLine(H, j_2) → l_2
19. Polygon(E, F, G, H) → poly2, e_1, f_1, g_1, h_1
20. Angle(poly2) → e, f, g, h
21. Polygon(I, J, K, L) → poly3, i_1, j_1, k_1, l_1
22. Angle(poly3) → i, j, k, l