史密斯先生的梯形面积探究

GeoGebra 命令及参数

1. Line(A, xAxis) → a_1
2. Intersect(xAxis, yAxis) → E
3. Polygon(E, B, C, D) → poly1, e, b_2, c, d
4. Polygon(E, B, C) → poly2, c_1, e_1, b_1
5. Polygon(E, C, D) → poly3, d_1, e_2, c_2
6. Vector(E, F) → u
7. Translate(E, u) → E'
8. Translate(B, u) → B'
9. Translate(C, u) → C'
10. Polygon(E', B', C') → poly2', c', e', b'
11. Vector(E, G) → v
12. Translate(E, v) → E'_1
13. Translate(C, v) → C'_1
14. Translate(D, v) → D'
15. Polygon(E'_1, C'_1, D') → poly3', d', e'_1, c'_1
16. OrthogonalLine(F, a_1) → g
17. Intersect(a_1, g) → H
18. Segment(B', H) → h_1
19. Segment(F, H) → h
20. OrthogonalLine(C'_1, c'_1) → j
21. Intersect(f, j, 1) → I
22. Segment(C'_1, I) → k
23. Segment(I, C'_1) → l
24. Segment(B, H) → i
25. Segment(H, E) → m
26. Segment(B', H) → n
27. Segment(H, F) → p
28. Segment(B', H) → q
29. Segment(H, F) → r
30. Segment(C'_1, I) → s
31. PointIn(poly1) → Pointpoly1
32. PointIn(poly2') → Pointpoly2'
33. PointIn(poly3') → Pointpoly3'_1
34. PointIn(poly3') → Pointpoly3'