梯形的几何作图

GeoGebra 命令及参数

1. Line(A, B) → f
2. Line(C, f) → g
3. Point(g) → D
4. Point(g) → E
5. Segment(A, D) → h
6. Segment(E, B) → i
7. Segment(B, A) → j
8. Segment(D, E) → k
9. Polygon(A, B, E, D) → q1, a, b, e, d
10. Angle(A, D, E) → α
11. Angle(q1) → β, γ, δ, ε
12. Segment(A, E) → l
13. Segment(D, B) → m
14. Intersect(l, m) → F
15. Angle(A, F, B) → ζ
16. Angle(B, F, E) → η
17. Angle(E, F, D) → θ
18. Angle(D, F, A) → ι