矩形比例演示

GeoGebra 命令及参数

1. OrthogonalLine(A, xAxis) → f
2. OrthogonalLine(A, yAxis) → g
3. Point(f) → B
4. Distance(A, B) → a
5. OrthogonalLine(D, g) → h
6. OrthogonalLine(B, f) → i
7. Intersect(h, i) → C
8. Polygon(A, B, C, D) → q1, a_1, b_1, d, c
9. Rotate(A, (-α), Cent) → A'
10. Rotate(B, (-α), Cent) → B'
11. Rotate(C, (-α), Cent) → C'
12. Rotate(D, (-α), Cent) → D'
13. Polygon(A', B', C', D') → q1', a', b', c', d'
14. Segment(A' + (0, 0.2), D' + (0, 0.2)) → j
15. Segment(D + (0.2, 0), C + (0.2, 0)) → k
16. Circle(A', 0.2) → e
17. Circle(D', 0.2) → p
18. Circle(C', 0.2) → q
19. Line(B', A') → l
20. Line(A', D') → m
21. Line(D', C') → n
22. Circle(A', 0.2) → s
23. Circle(D', 0.2) → t
24. Circle(C', 0.2) → c_1
25. Line(B', C') → f_1
26. Intersect(s, l, 2) → E
27. Intersect(t, n, 1) → F
28. Segment(E, F) → g_1
29. Intersect(t, m, 2) → G
30. Intersect(c_1, f_1, 2) → H
31. Segment(H, G) → h_1
32. Midpoint(g_1) → I
33. Midpoint(h_1) → J
34. OrthogonalLine(I, g_1) → i_1
35. OrthogonalLine(J, h_1) → j_1
36. Circle(I, 0.4) → d_1
37. Circle(J, 0.2) → e_1
38. Intersect(d_1, i_1, 2) → K
39. Intersect(e_1, j_1, 1) → L
40. Text(r, K, true, true) → text1
41. Text("1", L, true, true) → text2
42. If(α ≟ 0, landtext, If[α ≟ 90°, porttext, ""]) → orienttext