三角形的质心、外心、内心和垂心

GeoGebra 命令及参数

1. Polygon(A, B, C) → t1, c, a, b
2. Segment(Midpoint[a], A) → r
3. Segment(Midpoint[c], C) → p
4. Intersect(LineBisector[a], LineBisector[b]) → Circumcenter
5. Segment(Midpoint[c], Circumcenter) → i
6. Segment(Midpoint[b], Circumcenter) → j
7. Segment(Midpoint[a], Circumcenter) → k
8. Segment(A, Circumcenter) → l
9. Segment(Circumcenter, C) → m
10. Segment(Circumcenter, B) → n
11. Segment(Midpoint[b], B) → q
12. Intersect(p, r) → Centroid
13. Segment(B, Centroid) → s
14. Segment(A, Centroid) → t
15. Segment(C, Centroid) → u
16. Circle(A, B, C) → d
17. Segment(C, Center[Incircle[A, B, C]]) → gi
18. Segment(A, Center[Incircle[A, B, C]]) → hi
19. Intersect(gi, hi) → Incenter
20. Incircle(A, B, C) → Incircle
21. Segment(B, Center[Incircle[A, B, C]]) → fi
22. Segment(Incenter, Intersect[OrthogonalLine[Incenter, a], a]) → f
23. Segment(Incenter, Intersect[OrthogonalLine[Incenter, b], b]) → g
24. Segment(Incenter, Intersect[OrthogonalLine[Incenter, c], c]) → h
25. OrthogonalLine(C, Line[B, A]) → g_1
26. OrthogonalLine(A, Line[B, C]) → h_1
27. Intersect(g_1, h_1) → Orthocenter
28. OrthogonalLine(B, Line[C, A]) → f_1
29. Line(B, c) → i_1
30. Line(C, b) → j_1
31. Line(C, a) → k_1