梯形与调和平均数 by Norm Prokup (2)

GeoGebra 命令及参数

1. Line(D, C) → f
2. Line(A, f) → g
3. Point(g) → B
4. Line(D, A) → h
5. Line(B, C) → i
6. Segment(A, C) → j
7. Segment(B, D) → k
8. Segment(D, C) → b
9. Segment(A, D) → m
10. Segment(B, C) → n
11. Segment(A, B) → a
12. Intersect(j, k) → E
13. Line(E, b) → q
14. Intersect(h, q) → P
15. Intersect(i, q) → Q
16. Segment(P, Q) → r
17. Segment(E, Q) → l
18. Segment(P, E) → p
19. Angle(C, D, A) → α
20. Angle(E, P, A) → β
21. Angle(A, E, P) → γ
22. Angle(E, C, D) → δ
23. Angle(B, Q, E) → ε
24. Angle(Q, C, D) → ζ
25. Angle(Q, E, B) → η
26. Angle(C, D, E) → θ