三角形垂心 by hasulkin2

GeoGebra 命令及参数

1. Segment(A, B) → a
2. Segment(B, C) → b
3. Segment(A, C) → c
4. OrthogonalLine(A, b) → d
5. OrthogonalLine(B, c) → e
6. OrthogonalLine(C, a) → f
7. Intersect(d, e) → D
8. Intersect(e, c) → E
9. Angle(D, E, C) → α
10. Angle(d, b) → β
11. Intersect(d, b) → F
12. Angle(D, F, B) → γ
13. Angle(D, F, B) → δ
14. Intersect(f, b) → G
15. Intersect(f, a) → H
16. Angle(B, H, D) → ε