切线交点中点

GeoGebra 命令及参数

1. Circle(A, B) → c
2. Point(c) → C
3. Point(c) → D
4. Tangent(C, c) → q_1,
5. Segment(A, C) → r_1
6. Tangent(D, c) → c_1,
7. Intersect(q_1, c_1) → R
8. Segment(D, R) → d_1
9. Segment(C, R) → e_1
10. Segment(A, D) → f_2
11. Angle(A, D, R) → τ
12. Segment(A, R) → g_2
13. Angle(D, R, A) → υ
14. Angle(D, R, C) → ϕ
15. Angle(A, R, C) → χ
16. Angle(A, C, R) → α