平行四边形边长探究

GeoGebra 命令及参数

1. Line(A, B) → a
2. Slope(a) → m
3. PointIn(c) → C
4. Line(C, a) → e
5. Vector(A, B) → u
6. Translate(C, u) → C'
7. Segment(A, B) → h
8. Segment(A, C) → d
9. Polygon(A, B, C') → poly1, c', a_1, b_1
10. Polygon(A, C', C) → poly2, c_1, a_2, c'_1
11. Dilate(A, If[0 < k ≤ 1, 1 - k, 0], C) → A'
12. Vector(A, A') → v
13. Translate(A, v) → A'_1
14. Translate(B, v) → B'
15. Segment(A'_1, B') → h'
16. Dilate(C, If[1 < k ≤ 2, 2 - k, 0], C') → C'_1
17. Vector(C, C'_1) → w
18. Translate(A, w) → A'_2
19. Translate(C, w) → C'_2
20. Segment(A'_2, C'_2) → d'
21. Polygon(A, B, C', C) → poly3, a_3, b_2, c'_2, c_2