圆盘法求旋转体体积：动态可调交互演示

GeoGebra 命令及参数

1. Sequence(Polygon[(a + (i * deltax), 0), (a + ((i + 1) * deltax), 0), (a + ((i + 1) * deltax), f(a + ((i + 1) * deltax))), (a + (i * deltax), f(a + ((i + 1) * deltax)))], i, 0, n - 1, 1) → list1
2. Rotate(list1, α, y = 0) → list1'
3. Intersect(i, l) → B
4. Intersect(k, l) → C
5. Intersect(j, k) → D
6. Polygon(C, B, A, D) → poly1, c_2, b_1, a_1, d
7. Rotate(C, α, y = 0) → C'
8. Rotate(B, α, y = 0) → B'
9. Rotate(A, α, y = 0) → A'
10. Rotate(D, α, y = 0) → D'
11. Polygon(C', B', A', D') → poly1', c', b', a', d'
12. Sequence((a + (i * deltax), 0), i, 0, n, 1) → list2
13. Sequence((a + (i * deltax), f(a + (i * deltax))), i, 1, n, 1) → list3
14. Rotate(list3, α, y = 0) → list3'
15. Sequence((a + (i * deltax), f(a + ((i + 1) * deltax))), i, 0, n - 1, 1) → list4
16. Sequence(x = a + (i * deltax), i, 1, n, 1) → list6
17. Sequence(Segment[Element[list3, i], Element[list4, i]], i, 0, n, 1) → list5
18. Sequence(CircleSector[Element[list2, i + 1], Element[list3', i], Element[list3, i], xOyPlane], i, 1, n, 1) → list7
19. Sequence(Cylinder[Element[list2, i], Element[list2, i + 1], f(Element[list2, i + 1])], i, 1, n, 1) → list8
20. Sequence(Circle[Element[list2, i], f(Element[list2, i]), x = 0], i, 2, n + 1, 1) → list10
21. Circle((a, 0), f(a + deltax), x = 0) → p
22. Surface(q, α, xAxis) → e
23. Cylinder((x(A), 0), (x(A) - deltax, 0), y(A)) → o, r, s, t
24. Dilate(E, If[0 < u ≤ 1, 1 - u, 0], D) → E'
25. Dilate(F, If[0 < u ≤ 1, 1 - u, 0], A) → F'
26. Segment(E, E') → f_1
27. Segment(F, F') → g_1
28. Dilate(D, If[1 < u ≤ 2, 2 - u, 0], A) → D'_1
29. Segment(D, D'_1) → h_1
30. Rotate(F, α, y = 0) → F'_1
31. Rotate(F', α, y = 0) → F''
32. Segment(F'_1, F'') → i_1
33. Rotate(E, α, y = 0) → E'_1
34. Rotate(E', α, y = 0) → E''
35. Segment(E'_1, E'') → j_1
36. Rotate(D, α, y = 0) → D'_2
37. Rotate(D'_1, α, y = 0) → G
38. Segment(D'_2, G) → k_1
39. Textfield(f) → InputBox1
40. Textfield(a) → InputBox2
41. Textfield(b) → InputBox3
42. Integral(f, a, b) → m_1