相似三角形练习1

GeoGebra 命令及参数

1. Polygon(A, B, C) → Polygon1, c, a, b
2. Point(b) → D
3. Line(D, c) → d
4. Intersect(d, a) → E_1
5. Segment(E_1, B) → help
6. Point(help) → F_1
7. Line(F_1, b) → e
8. OrthogonalLine(A, a) → f
9. Intersect(d, e) → F
10. Intersect(e, c) → E
11. OrthogonalLine(F, a) → g
12. OrthogonalLine(E, a) → h_4
13. OrthogonalLine(D, a) → i
14. Intersect(i, a) → I
15. Intersect(g, a) → J
16. Intersect(h_4, a) → K
17. Intersect(f, a) → L
18. Segment(A, L) → h
19. Segment(I, D) → h_1
20. Segment(F, J) → h_2
21. Segment(E, K) → h_3
22. Polygon(D, E_1, C) → Polygon2, c_1, d_1, e_1
23. Polygon(F_1, F, E_1) → Polygon3, e_2, f_1, g_1
24. Polygon(E, B, F_1) → Polygon4, f_2, h_5, b_1