三个向量的加法演示

GeoGebra 命令及参数

1. Vector(A, B) → u
2. Vector(C, D) → v
3. Translate(A, Vector[(If[a < 3, a / 3, 1] * Vector[A, E])]) → A'
4. Translate(B, Vector[(If[a < 3, a / 3, 1] * Vector[A, E])]) → B'
5. Vector(A', B') → w
6. Translate(C, Vector[(If[a ≤ 3, 0, If[3 < a < 6, (a - 3) / 3, 1]] * Vector[C, B'])]) → C'
7. Translate(D, Vector[(If[a ≤ 3, 0, If[3 < a < 6, (a - 3) / 3, 1]] * Vector[C, B'])]) → D'
8. Vector(C', D') → b
9. Midpoint(B, A) → L
10. Midpoint(C, D) → M
11. Midpoint(C', D') → N
12. Midpoint(B', A') → O
13. Vector(F, G) → d
14. Midpoint(F, G) → H
15. Translate(F, Vector[(If[a ≤ 6, 0, If[6 < a < 9, (a - 6) / 3, 1]] * Vector[F, D'])]) → D'_1
16. Translate(G, Vector[(If[a ≤ 6, 0, If[6 < a < 9, (a - 6) / 3, 1]] * Vector[F, D'])]) → G'
17. Vector(D'_1, G') → c
18. Translate(E, Vector[(If[a ≤ 9, 0, If[9 < a < 12, (a - 9) / 3, 1]] * Vector[E, G'])]) → E'
19. Vector(E, E') → e
20. Midpoint(D'_1, G') → I
21. Midpoint(E, E') → J
22. Line(E', xAxis) → f
23. Point(f) → K
24. Angle(E, E', K) → α
25. RotateText(texte7, (-α)) → texte8