最大化等腰三角形内切圆面积

GeoGebra 命令及参数

1. Polygon(D, E, F) → poly3, f, d, e
2. AngularBisector(f, d) → q, r
3. AngularBisector(e, d) → s, t_{1}
4. Intersect(r, t_{1}) → O
5. OrthogonalLine(O, f) → i_1
6. OrthogonalLine(O, d) → j_1
7. OrthogonalLine(O, e) → l_1
8. Intersect(i_1, f) → B_1
9. Intersect(j_1, d) → C_1
10. Segment(O, C_1) → m_1
11. Segment(O, B_1) → p_1
12. Circle(O, B_1) → q_1
13. Segment(E, O) → f_1
14. Segment(F, O) → g_1
15. Segment(D, O) → h_1
16. Segment(D, E) → g
17. Segment(E, F) → h
18. Circle(E, F) → c
19. Segment(D, F) → i
20. Area(q_1) → a
21. PointIn(q_1) → Pointq1
22. Intersect(q_1, i, 1) → A
23. Distance(O, A) → distanceOA
24. Distance(D, F) → distanceDF
25. Angle(F, D, E) → α
26. Segment(O, A) → j