四边形内角和 by Priyanka

GeoGebra 命令及参数

1. Polygon(A, B, C, D) → veelhoek1, a, b, c, d
2. Segment(A, C) → e
3. Midpoint(b) → G
4. Midpoint(d) → H
5. Circle(A, r) → f
6. Circle(B, r) → g
7. Circle(C, r) → h
8. Circle(D, r) → k
9. Intersect(f, a, 1) → E
10. Intersect(f, d, 1) → I
11. Intersect(g, a, 1) → J
12. Intersect(g, b, 1) → K
13. Intersect(h, b, 1) → L
14. Intersect(h, c, 1) → M
15. Intersect(k, c, 1) → N
16. Intersect(k, d, 1) → O
17. CircleSector(A, E, I) → p
18. CircleSector(C, M, L) → q
19. CircleSector(D, O, N) → s
20. Rotate(D, α, H) → D'
21. Rotate(O, α, H) → O'
22. Rotate(N, α, H) → N'
23. Sector(Rotate[Circle[D, O], α, H], O', N') → s'
24. Rotate(C, (-α), G) → C'
25. Rotate(M, (-α), G) → M'
26. Rotate(L, (-α), G) → L'
27. Sector(Rotate[Circle[C, M], (-α), G], M', L') → q'
28. CircleSector(B, K, J) → t
29. Midpoint(a) → F
30. Rotate(M', (-β), F) → M''
31. Rotate(L', (-β), F) → L''
32. Sector(Rotate[Rotate[Circle[C, M], (-α), G], (-β), F], M'', L'') → q''
33. Rotate(t, (-β), F) → t'