角平分线定理探究 by Tim Brzezinski

GeoGebra 命令及参数

1. Ray(A, B) → a
2. Ray(A, C) → b
3. Segment(K, J) → c
4. OrthogonalLine(A, a) → d
5. Circle(A, c) → e
6. Intersect(e, d) → F_1, G_1
7. OrthogonalLine(F_1, d) → f
8. OrthogonalLine(A, b) → g
9. Circle(A, c) → h
10. Intersect(h, g) → H_1, I_1
11. OrthogonalLine(I_1, g) → i
12. Intersect(f, i) → D
13. OrthogonalLine(D, b) → j
14. OrthogonalLine(D, a) → k
15. Intersect(k, a) → E
16. Intersect(j, b) → F
17. Segment(D, E) → l
18. Segment(D, F) → m
19. Angle(C, F, D) → α
20. Angle(D, F, A) → β
21. Angle(A, E, D) → γ
22. Angle(C, A, D) → δ
23. Angle(D, A, B) → ε
24. Ray(A, D) → n