矩形家族中的最大值现象

GeoGebra 命令及参数

1. Point(xAxis) → A
2. OrthogonalLine(A, xAxis) → g
3. OrthogonalLine(A, g) → h
4. Intersect(h, xAxis) → F
5. Circle(A, a) → d_{2}
6. Point(d_{2}) → P
7. Circle(P, c) → e
8. Circle(P, b) → f
9. Segment(P, A) → i
10. Intersect(f, g, 2) → B
11. Line(B, h) → j
12. Intersect(e, j, 1) → C
13. Line(C, g) → k
14. Intersect(h, k) → D
15. Segment(B, P) → d
16. Segment(P, C) → m
17. Segment(P, D) → n
18. Polygon(B, A, D, C) → q1, c_1, a_1, e_1, d_1
19. Intersect(d_{2}, a_1, 1) → B_{1}
20. Intersect(d_{2}, xAxis, 2) → E
21. Angle(E, A, P) → α