三角形与梯形中位线

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → A
2. Point(xAxis) → B
3. Point(yAxis) → C
4. Segment(C, D) → a
5. Segment(A, B) → b
6. Point(a) → E
7. Point(a) → F
8. Point(b) → G
9. Point(b) → H
10. Midpoint(G, E) → I
11. Midpoint(H, F) → J
12. Segment(E, F) → EF
13. Segment(F, H) → d
14. Segment(H, G) → GH
15. Segment(G, E) → f
16. Segment(I, J) → IJ
17. Angle(IJ, f) → α
18. Angle(H, G, E) → β
19. Angle(E, F, H) → ε
20. Angle(G, E, F) → ζ
21. Angle(F, H, G) → δ
22. Angle(F, J, I) → γ
23. Textfield(E) → inputBox1