三角形的垂心、内切圆半径与外接圆半径

GeoGebra 命令及参数

1. Polygon(A, B, C) → t1, c, a, b
2. Circle(A, B, C) → d
3. Incircle(A, B, C) → e
4. OrthogonalLine(A, a) → f
5. OrthogonalLine(C, c) → g
6. Intersect(f, g) → H
7. Segment(A, H) → h
8. Segment(H, B) → i
9. Segment(H, C) → j
10. Center(e) → I
11. Center(d) → O
12. Point(e) → D
13. Segment(I, D) → k
14. Point(d) → E
15. Segment(O, E) → l
16. Line(F, G) → m
17. Circle(F, h) → p
18. Intersect(p, m, 2) → J
19. Circle(J, i) → q
20. Intersect(q, m, 2) → K
21. Circle(K, j) → r
22. Intersect(r, m, 2) → L
23. Segment(F, J) → s
24. Segment(J, K) → t
25. Segment(K, L) → f_1
26. Line(M, N) → g_1
27. Circle(M, k) → c_1
28. Intersect(c_1, g_1, 2) → P
29. Circle(P, k) → d_1
30. Intersect(d_1, g_1, 2) → Q
31. Circle(Q, l) → e_1
32. Intersect(e_1, g_1, 2) → R
33. Circle(R, l) → h_1
34. Segment(M, P) → i_1
35. Segment(P, Q) → j_1
36. Segment(Q, R) → k_1
37. Intersect(h_1, g_1, 2) → S
38. Segment(R, S) → l_1