余弦定理钝角三角形演示

GeoGebra 命令及参数

1. Point({0, 0}) → A
2. Point({0, 1}) → B_1
3. Point({1, 0}) → C_1
4. Ray(A, C_1) → f
5. Point({-10, 0}) → D_1
6. Point({-10, 10}) → E
7. Point({0, 10}) → F
8. Polygon(A, D_1, E, F) → q1, a, d, e, f_1
9. PointIn(q1) → B
10. Point(f) → C
11. Polygon(A, B, C) → t1, h, a_1, g
12. Polygon(B, C, 4) → poly1, i, j, k, l, I, J
13. Polygon(B, A, 4) → poly2, m, n, p, q, K, L
14. OrthogonalLine(B, f) → r
15. Intersect(r, xAxis) → D
16. Polygon(D, B, 4) → poly3, s, t, b, c, N, O
17. Polygon(C, D, 4) → poly4, g_1, h_1, i_1, j_1, P, Q
18. Polygon(C, A, 4) → poly5, k_1, l_1, m_1, n_1, R, S
19. OrthogonalLine(A, f) → p_1
20. Intersect(p_1, i_1) → T
21. Polygon(P, T, 4) → poly6, q_1, r_1, s_1, t_1, U, V
22. Segment(A, D) → b_1
23. Segment(D, V) → c_1
24. Segment(T, Q) → d_1
25. Segment(Q, S) → e_1
26. Polygon(V, R, A, D) → q2, v, r_2, a_2, m_2
27. Polygon(R, T, Q, S) → q3, r_3, t_2, q_2, s_2