橄榄球形状及其周长 by spkwan (2)

GeoGebra 命令及参数

1. Point(a) → A
2. Point(a) → B
3. Circle(A, B) → c
4. Intersect(c, a, 2) → C
5. Rotate(C, angC°, A) → C'
6. Rotate(A, (180 - angC - angD)°, C') → A'
7. Ray(C', A') → b
8. Intersect(a, b) → F
9. Distance(C', F) → C'F
10. Angle(C, A, C') → α
11. Rotate(C, ((-angC))°, A) → C'_1
12. Angle(C, A, C'_1) → β
13. Circle(D, E) → d
14. Rotate(E, angD°, D) → E'
15. Angle(E, D, E') → γ
16. Rotate(E, ((-angD))°, D) → E'_1
17. Angle(E, D, E'_1) → δ
18. Angle(A, C', A') → ε
19. Point(c) → H
20. Rotate(H, ((2 * angC))°, A) → H'
21. Angle(H, A, H') → ζ
22. CircleArc(A, H, H') → e
23. Point(d) → I
24. Rotate(I, ((2 * angD))°, D) → I'
25. Angle(I, D, I') → η
26. CircleArc(D, I, I') → f
27. Segment(A, C') → g
28. Segment(A, C'_1) → h
29. Angle(C'_1, A, C') → θ
30. Segment(D, C') → j