单位圆内正多边形的面积与周长

GeoGebra 命令及参数

1. Circle(A, 1) → c
2. Point(c) → B
3. Rotate(B, (360 / n)°, A) → B'
4. Polygon(B, B', n) → polygon, a, k, U, V, W, Z, A_1, B_1, C_1, D_1, E_1, F_1, l, G_1, H_1, I_1, J_1, K_1, L_1, M_1, N_1, O_1, P_1, m, Q_1, R_1, S_1, T_1, U_1, V_1, W_1, Z_1, A_2, B_2, p, C_2, D_2, E_2, F_2, G_2, H_2, I_2, J_2, K_2, L_2, q, M_2, N_2, O_2, P_2, Q_2, R_2, S_2, T_2, U_2, V_2, r, W_2, Z_2, A_3, B_3, C_3, D_3, E_3, F_3, G_3, H_3, s, I_3, t, a_1, b_1, b, c_1, d_1, e_1, f_1, g_1, h_1, i_1, j_1, k_1, l_1, d, m_1, n_1, p_1, q_1, r_1, s_1, t_1, a_2, b_2, c_2, e, d_2, e_2, f_2, g_2, h_2, i_2, j_2, k_2, l_2, m_2, f, n_2, p_2, q_2, r_2, s_2, t_2, a_3, b_3, c_3, d_3, g, e_3, f_3, g_3, h_3, i_3, j_3, k_3, l_3, m_3, n_3, h, p_3, q_3, r_3, s_3, t_3, a_4, b_4, c_4, d_4, e_4, i, f_4, g_4, C, D, E, F, G, H, I, J, j, K, L, M, N, O, P, Q, R, S, T
5. Perimeter(polygon) → perimeterpoly1
6. PointIn(polygon) → Pointpoly1_1
7. PointIn(polygon) → Pointpoly1
8. Area(c) → o
9. PointIn(c) → Pointc_1
10. Area(c) → u
11. PointIn(c) → Pointc_2
12. Area(c) → v
13. PointIn(c) → Pointc_3
14. Area(c) → w
15. PointIn(c) → Pointc
16. PointIn(polygon) → Pointpolygon