抛物线性质

GeoGebra 命令及参数

1. Tangent(A, c) → h,
2. Intersect(g, l) → I
3. Point(l) → Q
4. Point(c) → B
5. Tangent(B, c) → f,
6. Intersect(f, g) → C
7. OrthogonalLine(C, f) → i
8. Intersect(c, i) → D, H
9. Angle(D, C, B) → α
10. Point(c) → E
11. Tangent(E, c) → k,
12. OrthogonalLine(F, k) → m
13. Intersect(m, k) → G
14. Angle(F, G, E) → β
15. Segment(F, G) → n