三角形比例定理

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → A
2. Point(xAxis) → B
3. Polygon(A, B, C) → Polygon1, c_1, a_1, b_1
4. Point(b_1) → D
5. Line(D, c_1) → d_1
6. Intersect(d_1, a_1) → E
7. Segment(D, E) → e
8. Segment(E, A) → f
9. OrthogonalLine(E, b_1) → g
10. Intersect(g, b_1) → F
11. Segment(F, E) → h
12. Angle(E, F, C) → α
13. Polygon(D, E, C) → CDE, c_2, c_3, a_3
14. Polygon(A, E, D) → ADE, d_2, a_2, b_2
15. Segment(B, E) → d
16. Segment(D, C) → a
17. Segment(A, D) → b
18. Segment(C, E) → c
19. Polygon(D, A, E) → poly1, e_1, poly1segment, a_4
20. Polygon(B, E, D) → poly2, d_4, b_3, poly2segment
21. Polygon(D, E, C) → poly3, c_4, d_5, e_3
22. Polygon(A, E, D) → poly4, poly4segment, a_5, e_2
23. Polygon(E, C, D) → poly5, d_3, e_4, c_5
24. Polygon(B, E, D) → poly6, d_6, b_4, poly6segment