四边形命名与内外角和

GeoGebra 命令及参数

1. Vector(B, A) → w
2. If((4 ≤ n) ∧ (n ≤ 5), n - 4, 1) → W
3. If((2 ≤ n) ∧ (n ≤ 3), n - 2, 1) → S
4. If((1 ≤ n) ∧ (n ≤ 2), n - 1, 1) → Q
5. If((0 ≤ n) ∧ (n < 1), n, 1) → P
6. If(P < 1, 0, Q) → R
7. If(R < 1, 0, S) → T
8. If((3 ≤ n) ∧ (n ≤ 4), n - 3, 1) → U
9. If(T < 1, 0, U) → V
10. If(V < 1, 0, W) → Z
11. Rotate(D, (V * 180)°, B) → K
12. Vector(D, A) → u
13. Line(A, B) → a
14. Line(C, D) → b
15. Line(A, C) → c
16. Line(B, D) → d
17. Angle(C, A, B) → α
18. Line(D, A) → f
19. Line(E, d) → g
20. Line(E, b) → h
21. Angle(F, E, G) → β
22. Vector(C, A) → v
23. Rotate(A, (P * 180)°, C) → J
24. Rotate(D, (P * 180)°, C) → I
25. Rotate(A, (V * 180)°, B) → H
26. Angle(J, L, M) → γ
27. Angle(H, O, N) → δ
28. Polygon(A, C, D, B) → poly1, a_1, c_1, d_1, b_1
29. OrthogonalLine(C, c_1) → e
30. Intersect(e, a) → E_1
31. OrthogonalLine(E_1, e) → i
32. OrthogonalLine(B, d) → j
33. Intersect(j, c) → F_1
34. OrthogonalLine(F_1, j) → k
35. Angle(C, A, B) → ε