等腰梯形定理（三种不同定理）

GeoGebra 命令及参数

1. Point(Circle[A, 6]) → C
2. Segment(A, C) → f
3. Point(Circle[B, 8]) → D
4. Segment(B, D) → g
5. Segment(A, B) → h
6. Segment(C, D) → i
7. Segment(A, D) → j
8. Segment(C, B) → k
9. Distance(A, C) → distanceAC
10. Distance(C, D) → distanceCD
11. Distance(A, B) → distanceAB
12. Distance(B, D) → distanceBD
13. Distance(B, C) → distanceBC
14. Distance(A, D) → distanceAD
15. Angle(B, A, D) → α
16. Angle(D, A, C) → β
17. Angle(A, C, B) → γ
18. Angle(C, D, A) → δ
19. Angle(D, B, C) → ε
20. Angle(C, B, A) → ζ
21. Angle(A, D, B) → η
22. Angle(B, C, D) → θ
23. Point(Circle[E, 7]) → G
24. Segment(E, G) → l
25. Point(Circle[F, 9]) → H
26. Segment(F, H) → m
27. Segment(E, F) → n
28. Segment(G, H) → p
29. Angle(H, F, E) → ι
30. Angle(E, G, H) → κ
31. Angle(G, H, F) → λ
32. Angle(F, E, G) → μ
33. Distance(E, G) → distanceEG
34. Distance(G, H) → distanceGH
35. Distance(H, F) → distanceHF
36. Distance(F, E) → distanceFE
37. Point(Circle[I, 8]) → K
38. Segment(I, K) → q
39. Point(Circle[J, 10]) → L
40. Segment(J, L) → r
41. Segment(I, J) → s
42. Segment(K, L) → t
43. Point(s) → M
44. Point(t) → N
45. Segment(M, N) → a
46. Distance(I, M) → distanceIM
47. Midpoint(I, M) →
48. Distance(M, J) → distanceMJ
49. Midpoint(M, J) →
50. Distance(K, N) → distanceKN
51. Midpoint(K, N) →
52. Distance(N, L) → distanceNL
53. Midpoint(N, L) →