梯形面积与周长测验

GeoGebra 命令及参数

1. Segment(A_2, B_2) → f_2
2. Line(C_2, f_2) → g_2
3. Point(g_2) → D_2
4. Segment(D_2, C_2) → h_2
5. Polygon(D_2, A_2, B_2, C_2) → poly1_2, d_2, a_2, b_2, c_2
6. Point(h_2) → E_2
7. OrthogonalLine(E_2, f_2) → i_2
8. Intersect(i_2, f_2) → F_2
9. Line(A_2, B_2) → k_2
10. OrthogonalLine(E_2, k_2) → l_2
11. Intersect(k_2, l_2) → G_2
12. Segment(E_2, G_2) → j_2
13. Segment(A_3, B_3) → f_3
14. Line(C_3, f_3) → g_3
15. Point(g_3) → D_3
16. Segment(D_3, C_3) → h_3
17. Polygon(D_3, A_3, B_3, C_3) → poly1_3, d_3, a_3, b_3, c_3
18. Point(h_3) → E_3
19. OrthogonalLine(E_3, f_3) → i_3
20. Intersect(i_3, f_3) → F_3
21. Line(A_3, B_3) → k_3
22. OrthogonalLine(E_3, k_3) → l_3
23. Intersect(k_3, l_3) → G_3
24. Segment(E_3, G_3) → j_3
25. Point(k_3) → A
26. Angle(E_3, G_3, A) → α
27. Point(k_2) → C
28. Angle(E_2, F_2, C) → γ