垂心 by Devin Chang

GeoGebra 命令及参数

1. Segment(A, B) → a
2. Segment(B, C) → b
3. Segment(C, A) → c
4. OrthogonalLine(C, a) → d
5. OrthogonalLine(A, b) → e
6. OrthogonalLine(B, c) → f
7. Intersect(d, e) → O
8. Intersect(d, a) → E
9. Intersect(f, c) → F
10. Intersect(e, b) → G
11. Segment(C, E) → g
12. Segment(B, F) → h
13. Segment(A, G) → i
14. Angle(C, E, A) → α
15. Angle(B, F, C) → β
16. Angle(A, G, B) → γ
17. Line(A, B) → j
18. Intersect(d, j) → D
19. Segment(C, D) → k
20. Angle(C, D, B) → δ
21. Line(B, C) → l
22. Polygon(A, B, C) → poly1, c_1, a_1, b_1
23. Intersect(e, l) → H
24. Segment(A, H) → m
25. Angle(A, H, C) → ε
26. Line(C, A) → n
27. Intersect(f, n) → I
28. Segment(B, I) → p
29. Angle(B, I, A) → ζ