平行四边形的覆盖面积与方格计数

GeoGebra 命令及参数

1. Segment(E, B) → d
2. Intersect(xAxis, yAxis) → A
3. Segment(D, A) → b
4. Segment(B, A) → a
5. OrthogonalLine(B, a) → g
6. Intersect(g, b) → J
7. OrthogonalLine(J, g) → k
8. Intersect(k, d) → L
9. Segment(D, E) → c
10. Segment(B, A) → e
11. Segment(A, C) → f
12. Intersect(g, c) → F
13. Polygon(B, A, D, F) → Mangekant1, b_1, a_1, d_1, f_1
14. Polygon(B, A, J) → Mangekant3, j, b_2, a_2
15. Polygon(G, K, M) → Mangekant4, m, g_2, k_1
16. OrthogonalLine(L, k) → l
17. Intersect(c, l) → O
18. Polygon(M, P, N, K) → Mangekant5, m_1, p, n, k_2
19. Polygon(Q, R, H) → Mangekant6, h_1, q, r
20. Polygon(G, I, S) → Mangekant7, s, g_3, i_1
21. Polygon(B, A, D, E) → Mangekant2, b_3, a_3, d_2, e_1