三角形的垂心 by Steve Phelps

GeoGebra 命令及参数

1. Sphere((0, 0, 0), 1) → a
2. PointIn(a) → A
3. PointIn(a) → B
4. PointIn(a) → C
5. Plane(D, C, A) → b
6. Plane(A, D, B) → c
7. Plane(B, C, D) → d
8. IntersectPath(b, a) → e
9. IntersectPath(d, a) → f
10. IntersectPath(c, a) → g
11. OrthogonalLine(C, c) → h
12. Plane(D, h) → i
13. IntersectPath(i, a) → k
14. OrthogonalLine(A, d) → j
15. Plane(D, j) → l
16. IntersectPath(l, a) → p
17. OrthogonalLine(B, b) → m
18. Plane(D, m) → n
19. IntersectPath(n, a) → q
20. Intersect(k, p, 2) → E