三角形与相关矩形面积计算

GeoGebra 命令及参数

1. Line(A, B) → a
2. OrthogonalLine(A, a) → b
3. Point(b) → C
4. OrthogonalLine(C, b) → c
5. Point(c) → D
6. Line(D, b) → h
7. Intersect(h, a) → F
8. Segment(D, F) → i
9. Polygon(A, B, D) → poly1_1, d, a_1, b_1
10. Rotate(D, 90°, F) → D'
11. Angle(D, F, D') → β
12. Point(a) → H
13. Line(H, b) → j
14. Intersect(j, c) → I
15. Segment(I, H) → k
16. Rotate(I, 90°, H) → I'
17. Rotate(H, 90°, I) → H'
18. Angle(H, I, H') → δ
19. Rotate(I, 270°, H) → I'_1
20. Angle(I'_1, H, I) → γ
21. Distance(D, F) → distanceDF
22. Distance(A, B) → distanceAB
23. Distance(D, F) → l
24. Line(C, A) → m
25. Line(B, m) → n
26. Intersect(c, n) → J
27. Segment(C, A) → p
28. Segment(J, B) → q
29. Segment(B, A) → r
30. Segment(C, J) → s
31. Polygon(A, B, J, C) → poly3, a_3, b_3, j_1, c_1