等腰性判定吗？薄片切割下的等腰三角形与概率极限

GeoGebra 命令及参数

1. Polygon(A, B, 3) → poly1, f, g, h, C
2. Polygon(D, E, 3) → poly2, i, j, k, F
3. Polygon(G, H, 3) → poly3, l, m, n, I
4. Polygon(J, K, 3) → poly4, p, q, r, L
5. Polygon(M, N, 3) → poly5, s, t, a, O
6. Polygon(P, Q, 3) → poly6, b, c, d, R
7. Midpoint(f) → S
8. Midpoint(i) → T
9. Midpoint(l) → U
10. Midpoint(p) → V
11. Midpoint(s) → W
12. Midpoint(b) → Z
13. Segment(C, S) → e
14. Segment(A, S) → f_1
15. Segment(S, B) → g_1
16. Segment(F, T) → h_1
17. Segment(I, U) → i_1
18. Segment(L, V) → j_1
19. Segment(O, W) → k_1
20. Segment(R, Z) → l_1
21. Angle(D, F, T) → α
22. Angle(T, F, E) → β
23. Angle(H, U, I) → γ
24. Angle(K, V, L) → δ
25. Angle(V, L, K) → ε
26. Angle(J, L, V) → ζ
27. Angle(N, W, O) → η
28. Segment(W, N) → m_1
29. Segment(M, W) → n_1
30. Angle(P, R, Z) → θ
31. Angle(Z, R, Q) → ι
32. Segment(P, Z) → p_1
33. Segment(Z, Q) → q_1
34. Segment(A_1, B_1) → r_1
35. Point(r_1) → C_1