矩形面积公式推导 by Austen Meek

GeoGebra 命令及参数

1. Polygon(A, B, 4) → poly1, a, b, c, d, C, D
2. Polygon(B, E, 4) → poly2, e, f, g, h, F, G
3. Polygon(E, H, 4) → poly3, i, j, k, l, I, J
4. Polygon(D, C, 4) → poly4, m, q, r, s, K, L
5. Polygon(C, F, 4) → poly5, t, a_1, b_1, c_1, M, N
6. Polygon(F, I, 4) → poly6, d_1, e_1, f_1, g_1, O, P
7. Polygon(Q, R, 4) → poly7, h_1, i_1, j_1, k_1, S, T
8. Polygon(U, V, 4) → poly8, l_1, m_1, n_1, p_1, W, Z
9. Polygon(Z, W, 4) → poly9, q_1, r_1, s_1, t_1, A_1, B_1
10. Polygon(V, C_1, 4) → poly10, a_2, b_2, c_2, d_2, D_1, E_1
11. Polygon(W, D_1, 4) → poly11, e_2, f_2, g_2, h_2, F_1, G_1
12. Polygon(C_1, H_1, 4) → poly12, i_2, j_2, k_2, l_2, I_1, J_1
13. Polygon(D_1, I_1, 4) → poly13, m_2, n_2, p_2, q_2, K_1, L_1
14. Segment(M_1, N_1) → r_2
15. Segment(N_1, O_1) → s_2
16. Segment(O_1, P_1) → t_2
17. Segment(P_1, M_1) → a_3
18. Segment(Q_1, R_1) → b_3
19. Segment(R_1, S_1) → c_3
20. Segment(S_1, T_1) → d_3
21. Segment(T_1, Q_1) → e_3
22. Segment(U_1, V_1) → f_3
23. Polygon(W_1, Z_1, A_2, B_2) → poly14, w_1, z_1, a_4, b_4
24. Textfield(A1) → inputBox1
25. Textfield(A2) → inputBox2
26. Polygon(C_2, D_2, E_2, F_2) → poly15, c_4, d_4, e_4, f_4
27. Textfield(A3) → inputBox3
28. Textfield(A4) → inputBox4