平行四边形的性质 by Janet Gilmore

GeoGebra 命令及参数

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