内切圆、外切圆与达朗贝尔球面

GeoGebra 命令及参数

1. Line(A, B) → f
2. Line(B, C) → g
3. Line(C, A) → h
4. AngularBisector(f, h) → i, j
5. AngularBisector(h, g) → k, l
6. Intersect(j, l) → D
7. Intersect(i, k) → E
8. OrthogonalLine(E, h) → n
9. OrthogonalLine(D, h) → p
10. Intersect(h, n) → F
11. Intersect(h, p) → G
12. Circle(D, G) → c
13. Circle(E, F) → d
14. Polygon(B, A, C) → poly1, c_1, b, a
15. Midpoint(B, A) → H
16. Midpoint(A, C) → I
17. Midpoint(C, B) → J
18. OrthogonalLine(A, xOyPlane) → m
19. Plane(m, h) → e
20. Point(d) → K
21. Sphere(E, K) → o
22. Point(c) → L
23. Sphere(D, L) → q
24. AngularBisector(A, B, C) → r
25. Point(r) → M
26. OrthogonalPlane(M, r) → s
27. Intersect(f, s) → N
28. Circle(r, N) → t
29. Segment(M, N) → f_1
30. Cone(M, B, f_1) → u, d_1, v
31. IntersectPath(e, u) → e_1
32. Corner(e_1)
33. Intersect(d, h) → O, P
34. Intersect(c, h) → Q, R