平行四边形周围的正方形

GeoGebra 命令及参数

1. Segment(A, B) → a
2. Segment(A, D) → b
3. Line(D, a) → c
4. Line(B, b) → d
5. Intersect(c, d) → C
6. Segment(D, C) → e
7. Segment(B, C) → f
8. Polygon(B, A, 4) → poly1, g, h, i, j, E, F
9. Polygon(A, D, 4) → poly2, k, l, m, n, G, H
10. Polygon(D, C, 4) → poly3, p, q, r, s, I, J
11. Polygon(C, B, 4) → poly4, t, a_1, b_1, c_1, K, L
12. Midpoint(F, A) → M
13. Midpoint(A, G) → N
14. Midpoint(D, I) → O
15. Midpoint(B, L) → P
16. Segment(M, P) → d_1
17. Segment(P, O) → e_1
18. Segment(O, N) → f_1
19. Segment(N, M) → g_1