平行四边形的性质 by Michael Petre

GeoGebra 命令及参数

1. Circle(A, B) → c
2. Line(B, A) → a
3. Intersect(c, a, 2) → C
4. Circle(A, D) → d
5. Line(D, A) → b
6. Intersect(d, b, 2) → E
7. Polygon(C, D, B, E) → poly1, c_1, d_1, b_1, e
8. Segment(C, B) → f
9. Segment(D, E) → g
10. Angle(C, D, E) → α
11. Angle(B, E, D) → β
12. Angle(B, C, D) → γ
13. Angle(C, B, E) → δ
14. Angle(D, A, C) → ε
15. Angle(E, D, B) → ζ
16. Angle(D, B, C) → η
17. Angle(D, E, C) → θ
18. Angle(E, C, B) → ι
19. Distance(C, A) → distanceCA
20. Midpoint(C, A) →
21. Distance(A, B) → distanceAB
22. Midpoint(A, B) →
23. Distance(D, A) → distanceDA
24. Midpoint(D, A) →
25. Distance(A, E) → distanceAE
26. Midpoint(A, E) →