开放中点：三角形面积问题（V2）

GeoGebra 命令及参数

1. PointIn(e) → A
2. PointIn(l(x, y) ∧ x ≥ x(A)) → C
3. PointIn(j) → B
4. Polygon(A, C, B) → t1, b_1, a_1, c_1
5. Segment(A, B) → f
6. Segment(B, C) → g
7. Segment(C, A) → h
8. SurdText(f) → text1
9. SurdText(g) → text2
10. SurdText(h) → text3
11. SurdText(t1) → text4
12. Mode(l1) → l2
13. Length(l2) → i
14. If(i ≟ 0, "No coordinates repeat!", "You have repeated coordinates.") → text5
15. Intersect(p, eq1) → D
16. Intersect(eq1, q) → E
17. Intersect(q, eq2) → F
18. Intersect(eq2, r) → G
19. Polygon(A, G, C) → t2, c_2, a_2, g_1
20. Polygon(A, F, B) → t4, b_2, a_4, f_1
21. Intersect(eq3, p) → H
22. Polygon(B, H, A) → t5, a_5, b_3, h_1
23. Polygon(B, E, C) → t6, c_4, b_4, e_1
24. Intersect(r, eq3) → I
25. Polygon(B, I, C) → t7, c_5, b_5, i_1