筝形的性质 by David T

GeoGebra 命令及参数

1. Line(A, B) → a
2. Polygon(A, B, C) → poly1, c, a_1, b
3. Angle(B, A, C) → α
4. Angle(A, C, B) → β
5. Angle(C, B, A) → γ
6. Segment(A, B) → d
7. Mirror(A, d) → A'
8. Mirror(B, d) → B'
9. Mirror(C, d) → C'
10. Polygon(A', B', C') → poly1', c', a', b'
11. Angle(B, C', A) → δ
12. Angle(A, B, C') → ε
13. Angle(C', A, B) → ζ
14. Segment(C, C') → e
15. Intersect(e, a) → D
16. Segment(C, D) → f
17. Segment(C', D) → g
18. Angle(A, C, C') → η
19. Angle(C, C', A) → θ
20. Angle(C', A, C) → ι
21. Angle(C, B, C') → κ
22. Angle(C', C, B) → λ
23. Angle(B, C', C) → μ
24. Angle(B, D, C) → ν
25. Segment(D, A) → h