梯形面积 by smm

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → A
2. Segment(C, D) → e
3. Segment(D, B) → f
4. Segment(B, A) → g
5. Segment(C, A) → h
6. Midpoint(h) → E
7. Midpoint(f) → F
8. OrthogonalLine(E, g) → i
9. OrthogonalLine(F, g) → j
10. OrthogonalLine(C, g) → k
11. OrthogonalLine(D, g) → l
12. Line(E, F) → m
13. Point(e) → G
14. Line(G, g) → n
15. Intersect(n, yAxis) → H
16. OrthogonalLine(B, n) → p
17. Intersect(n, p) → I
18. Polygon(H, A, B, I) → poly1, h_1, a_1, b_1, i_1
19. Polygon(H, A, C) → poly2, c_1, h_2, a_2
20. Translate(H, u) → H'
21. Translate(A, u) → A'
22. Translate(C, u) → C'
23. Polygon(H', A', C') → poly2', c', h', a'
24. Polygon(C, A, B, C') → poly3, c_2, a_3, b_2, c'_1
25. Segment(D, C') → q
26. Polygon(C, A, B, D) → poly4, c_3, a_4, b_3, d_1