三角形面积演示 by mrpettmaths

GeoGebra 命令及参数

1. Polygon(A, B, C) → poly1, c, a_1, b
2. Midpoint(c) → D
3. Rotate(A, α, D) → A'
4. Rotate(B, α, D) → B'
5. Rotate(C, α, D) → C'
6. Polygon(A', B', C') → poly1', c', a', b'
7. OrthogonalLine(A, a_1) → d
8. Intersect(d, a_1) → E
9. Circle(C, (a * a_1)) → e
10. Intersect(e, a_1, 1) → F
11. Vector(C, E) → u
12. Vector(E, A) → v
13. Translate(F, u) → F'
14. Vector(F, F') → w
15. Translate(F', v) → F''
16. Vector(F', F'') → f
17. Polygon(F'', F', F) → poly2, f_1, f'', f'
18. Polygon(A, E, B) → poly3, b_1, a_2, e_1
19. Segment(A, E) → g
20. Vector(C, B) → h
21. Circle(E, 0.5) → k
22. Intersect(k, d, 1) → G
23. Vector(C, B) → i
24. Translate(G, i) → G'
25. Vector(G, G') → j
26. OrthogonalLine(E, d) → l
27. Intersect(k, l) → H, I
28. Translate(H, f) → H'
29. Vector(H, H') → m
30. Segment(G', G) → n
31. Segment(H, H') → p
32. Line(C, d) → q
33. OrthogonalLine(G, q) → r
34. Intersect(q, r) → J
35. Translate(J, i) → J'
36. Vector(J, J') → s
37. Segment(J', J) → t
38. Segment(A, E) → c_1