平行四边形性质探索 by Monica Dunsworth

GeoGebra 命令及参数

1. Segment(A, B) → a
2. Line(C, a) → b
3. Segment(C, A) → c
4. Line(B, c) → d
5. Intersect(b, d) → D
6. Segment(C, D) → e
7. Segment(D, B) → f
8. Distance(e, c) → g
9. Distance(a, f) → h
10. Angle(D, B, A) → α
11. Angle(C, D, B) → β
12. Angle(A, C, D) → γ
13. Angle(B, A, C) → δ
14. Segment(C, B) → i
15. Segment(A, D) → j
16. Intersect(i, j) → E
17. Distance(C, E) → distanceCE
18. Distance(B, E) → distanceBE
19. Distance(D, E) → distanceDE
20. Distance(A, E) → distanceAE
21. Angle(D, E, C) → ε