三角形的四心

GeoGebra 命令及参数

1. Polygon(A, B, C) → poly1, c, a, b
2. Midpoint(A, B) → D
3. Midpoint(C, B) → E
4. Midpoint(A, C) → F
5. Line(B, F) → d
6. Line(C, D) → e
7. Line(A, E) → f
8. Intersect(e, d) → Centroid
9. AngularBisector(B, A, C) → g
10. AngularBisector(A, B, C) → h
11. AngularBisector(B, C, A) → i
12. Intersect(i, h) → Incenter
13. LineBisector(B, C) → j
14. LineBisector(C, A) → k
15. LineBisector(A, B) → l
16. Intersect(j, k) → Circumcenter
17. OrthogonalLine(B, b) → m
18. OrthogonalLine(C, c) → n
19. OrthogonalLine(A, a) → p
20. Intersect(p, m) → Orthocenter
21. Line(Orthocenter, Circumcenter) → EulerLine