三维几何图形

GeoGebra 命令及参数

1. CurveCartesian(sec(t) - 0.12, 0, (1.15 * tan(t)), t, ((-π)) / 2, π / 2) → a
2. CurveCartesian(sec(t) + 0.12, 0, (1.15 * tan(t)), t, ((-π)) / 2, π / 2) → b
3. Circle(zAxis, (2, 0, -2)) → c
4. Point(c) → A
5. Rotate(A, 120°, zAxis) → A'
6. Sequence((x(a(t)), 0, z(a(t))), t, ((-π)) / 2.97, (2 * π / 5), 0.2) → list1
7. Sequence((x(b(t)), 0, z(b(t))), t, ((-π)) / 2.97, (2 * π / 5), 0.2) → list2
8. Append(list1, (0, 0, 2.52)) → list3
9. Append(list3, (0, 0, -1.99)) → list4
10. Polygon(list4) → poly1
11. Append(list2, (4, 0, 2.52)) → list5
12. Append(list5, (4, 0, -1.99)) → list6
13. Polygon(list6) → poly2
14. Segment(A, A' + (0, 0, 4)) → f
15. Circle(zAxis, (2, 1, -2)) → e
16. Center(e) → B
17. PointIn(e) → C
18. Angle(A, B, C) → α
19. Segment(A, A' + (0, 0, 4)) → ff