任意三角形边上正多边形的面积

GeoGebra 命令及参数

1. Rotate(A, α, B) → A'
2. Angle(A, B, A') → γ
3. Ray(B, A) → a_1
4. Ray(B, A') → b
5. Point(a_1) → C
6. Rotate(B, (-β), C) → B'
7. Angle(B', C, B) → δ
8. Ray(C, B') → c
9. Intersect(c, b) → D
10. Polygon(D, B, C) → poly1, c_1, d, b_1
11. Angle(B, D, C) → ε
12. Polygon(D, C, change) → poly2, e, q_1, t_1, c_2, E, F, G, N, Q, T, W, f, B_1, E_1, H_1, g, h, i, d_1, g_1, j_1, m_1
13. Polygon(C, B, change) → poly3, j, r_1, a_2, d_2, H, I, J, O, R, U, Z, k, C_1, F_1, I_1, l, m, n, e_1, h_1, k_1, n_1
14. Polygon(B, D, change) → poly4, p, s_1, b_2, e_2, K, L, M, P, S, V, A_1, q, D_1, G_1, J_1, r, s, t, f_1, i_1, l_1, p_1