中位线

GeoGebra 命令及参数

1. Polygon(A, B, C) → t1, AB, BC, AC
2. LineBisector(AB) → f
3. LineBisector(BC) → g
4. LineBisector(AC) → h
5. Intersect(f, AB) → D
6. Intersect(g, BC) → E
7. Intersect(h, AC) → F
8. Segment(D, E) → DE
9. Segment(F, E) → FE
10. Segment(D, F) → DF
11. Angle(B, D, E) → α
12. Angle(D, A, F) → β
13. Angle(F, E, C) → γ
14. Angle(D, B, E) → δ
15. Angle(A, D, F) → ε
16. Angle(E, F, C) → ζ
17. Angle(A, F, D) → η
18. Angle(F, C, E) → θ
19. Angle(D, E, B) → ι