等腰梯形：几何作图与面积计算

GeoGebra 命令及参数

1. Segment(A, B) → a
2. OrthogonalLine(A, a) → b
3. OrthogonalLine(B, a) → c
4. Point(b) → C
5. OrthogonalLine(C, b) → d
6. Intersect(c, d) → D
7. Segment(C, D) → e
8. Point(e) → E
9. Segment(A, E) → f
10. Circle(B, f) → g
11. Intersect(g, e, 1) → F
12. Segment(F, B) → h
13. Segment(E, F) → i
14. Angle(F, B, A) → α
15. Angle(B, A, E) → β
16. Angle(E, F, B) → γ
17. Angle(A, E, F) → δ
18. Line(A, E) → j
19. Line(B, F) → k
20. Polygon(E, A, B, F) → poly1, e_1, a_1, b_1, f_1
21. Segment(A, B) → m
22. Segment(B, F) → n
23. Segment(F, E) → p
24. Segment(E, A) → q