平行四边形面积演示 by mrpettmaths

GeoGebra 命令及参数

1. Segment(A, C) → b
2. Segment(A, B) → c
3. Line(B, b) → d
4. Line(C, c) → e
5. Intersect(d, e) → D
6. Polygon(A, C, D, B) → poly1, a_1, c_1, d_1, b_1
7. OrthogonalLine(A, d_1) → f
8. Intersect(f, d_1) → E
9. Vector(B, E) → u
10. Vector(E, A) → v
11. Circle(B, (a * d_1)) → g
12. Intersect(g, d_1, 1) → F
13. Translate(F, u) → F'
14. Vector(F, F') → w
15. Translate(F', v) → F''
16. Vector(F', F'') → h
17. Polygon(F'', F', F) → poly2, f_1, f'', f'
18. Polygon(A, C, D, E) → poly3, a_2, c_2, d_2, e_1
19. Vector(A, C) → i
20. Circle(A, 0.5) → k
21. Intersect(k, f, 1) → G
22. Translate(G, i) → G'
23. Vector(G, G') → j
24. Line(A, d_1) → l
25. Intersect(k, l, 2) → H
26. Vector(A, E) → m
27. Translate(H, m) → H'
28. Vector(H, H') → n
29. Segment(G, G') → p
30. Segment(A, E) → q
31. Segment(H, H') → r