GeoGebra几何作图：金字塔与圆的构造

GeoGebra 命令及参数

1. PointIn(a) → A
2. PointIn(a) → B
3. PointIn(a) → C
4. Polygon(A, B, C) → poly1, c, a_1, b
5. OrthogonalLine(C, a) → d
6. Point(d) → D
7. Vector(C, D) → u
8. Translate(poly1, u) → poly1'
9. Polygon(C, D, A) → poly2, a_2, c_1, d_1
10. Polygon(D, B, C) → poly3, c_2, d_2, b_1
11. Polygon(A, B, D) → poly4, d_3, a_3, b_2
12. PointIn(poly1') → E
13. PointIn(poly1') → F
14. Polygon(E, A, F) → poly5, f, e, a_4
15. Polygon(A, D, E) → poly6, e_1, a_5, d_4
16. Polygon(F, D, A) → poly7, a_6, f_1, d_5
17. Polygon(F, B, A) → poly8, a_7, f_2, b_3
18. Polygon(F, D, B) → poly9, b_4, f_3, d_6
19. Polygon(D, A, F) → poly10, f_4, d_7, a_8
20. Intersect(a_2, c_1) → G
21. Plane(B, C, G) → j
22. Plane(F, A, B) → k