圆周率的近似值

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → A
2. Circle(A, 1) → c
3. Intersect(c, xAxis, 2) → B
4. Rotate(B, (360°) / n, A) → B'
5. Angle(B, A, B') → α
6. Polygon(B, B', n) → polygon_{small}, f, q, l_{22}, C, D, E, F, G, H, I, J, K, r, L, M, N, O, P, Q, R, S, T, U, s, V, W, Z, A_1, B_1, C_1, D_1, E_1, F_1, D_5, t, F_6, G_6, H_6, I_6, J_6, K_6, L_6, M_6, N_6, O_6, a, P_6, Q_6, R_8, S_8, T_8, U_8, V_8, W_8, Z_8, A_9, b, B_9, C_9, D_9, E_9, F_9, G_9, H_9, I_9, J_9, K_9, d, L_9, M_9, N_9, O_9, P_9, Q_9, R_9, S_9, T_9, U_9, e, V_9, W_9, Z_9, A_{10}, B_{10}, C_{10}, D_{10}, E_{10}, F_{10}, K_{16}, f_1, L_{16}, M_{16}, N_{16}, O_{16}, P_{16}, Q_{16}, R_{16}, S_{16}, T_{16}, U_{16}, g_1, V_{16}, W_{16}, Z_{16}, A_{17}, B_{17}, C_{17}, D_{17}, E_{17}, F_{17}, g, h_1, i_1, j_1, k_1, l_1, m_1, n_1, p_1, q_1, r_1, h, s_1, g_7, n_8, p_8, q_8, r_8, s_8, t_8, a_8, b_8, i, c_8, d_8, e_8, f_9, r_{11}, s_{11}, t_{11}, a_{11}, b_{11}, c_{11}, j, d_{11}, e_{11}, f_{12}, g_{12}, h_{12}, i_{12}, j_{12}, k_{12}, l_{12}, m_{12}, k, n_{12}, p_{12}, q_{12}, r_{12}, s_{12}, t_{12}, a_{12}, b_{12}, c_{12}, d_{12}, l, e_{12}, f_{13}, g_{13}, h_{13}, i_{13}, j_{13}, k_{13}, l_{13}, m_{13}, n_{13}, m, p_{13}, l_{21}, m_{21}, n_{21}, p_{21}, q_{21}, r_{21}, s_{21}, t_{21}, a_{21}, p, b_{21}, c_{21}, d_{21}, e_{21}, f_{22}, g_{22}, h_{22}, i_{22}, j_{22}, k_{22}
7. Rotate(B, (360°) / ((n * 2)), A) → B'_{1}
8. Angle(B, A, B'_{1}) → β
9. Line(A, B'_{1}) → k_3
10. OrthogonalLine(B'_{1}, k_3) → l_3
11. Intersect(l_3, xAxis) → K_2
12. Line(A, B') → m_3
13. Intersect(l_3, m_3) → L_2
14. Polygon(K_2, L_2, n) → polygon_{big}, n_3, l_4, n_{24}, M_2, N_2, S_2, T_2, U_2, V_2, W_2, Z_2, M_3, f_5, N_3, O_3, P_3, Q_3, R_3, G_4, H_4, I_4, J_4, K_4, g_5, L_4, M_4, F_5, G_5, H_5, I_5, J_5, K_5, L_5, M_5, h_5, F_7, G_7, H_7, I_7, J_7, K_7, L_7, M_7, N_7, O_7, i_5, P_7, Q_7, T_{11}, U_{11}, V_{11}, W_{11}, Z_{11}, A_{12}, B_{12}, C_{12}, j_5, D_{12}, E_{12}, F_{12}, G_{12}, H_{12}, I_{12}, J_{12}, K_{12}, L_{12}, M_{12}, k_5, N_{12}, O_{12}, P_{12}, Q_{12}, R_{12}, S_{12}, T_{12}, U_{12}, V_{12}, W_{12}, e_5, Z_{12}, A_{13}, B_{13}, C_{13}, D_{13}, E_{13}, F_{13}, G_{13}, H_{13}, C_{18}, f_6, D_{18}, E_{18}, F_{18}, G_{18}, H_{18}, I_{18}, J_{18}, K_{18}, L_{18}, M_{18}, g_6, N_{18}, O_{18}, P_{18}, Q_{18}, R_{18}, S_{18}, T_{18}, U_{18}, V_{18}, p_3, h_6, i_6, j_6, k_6, i_7, j_7, k_7, l_7, m_7, n_7, q_3, p_7, q_7, t_9, a_9, b_9, c_9, d_9, e_9, f_{10}, g_{10}, r_3, h_{10}, i_{10}, j_{10}, k_{10}, p_{15}, q_{15}, r_{15}, s_{15}, t_{15}, a_{15}, g_4, b_{15}, c_{15}, d_{15}, e_{15}, f_{16}, g_{16}, h_{16}, i_{16}, j_{16}, k_{16}, h_4, l_{16}, m_{16}, n_{16}, p_{16}, q_{16}, r_{16}, s_{16}, t_{16}, a_{16}, b_{16}, i_4, c_{16}, d_{16}, e_{16}, f_{17}, g_{17}, h_{17}, i_{17}, j_{17}, k_{17}, l_{17}, j_4, m_{17}, n_{23}, p_{23}, q_{23}, r_{23}, s_{23}, t_{23}, a_{23}, b_{23}, c_{23}, k_4, d_{23}, e_{23}, f_{24}, g_{24}, h_{24}, i_{24}, j_{24}, k_{24}, l_{24}, m_{24}