风筝形的性质 by eranderson

GeoGebra 命令及参数

1. Segment(A, B) → f
2. LineBisector(f) → g
3. Point(g) → C
4. Point(g) → D
5. Polygon(C, A, D, B) → poly1, c, a, d, b
6. Segment(C, D) → h
7. Segment(A, B) → i
8. Intersect(h, i) → E
9. Distance(D, E) → distanceDE
10. Distance(E, C) → distanceEC
11. Distance(B, E) → distanceBE
12. Distance(E, A) → distanceEA
13. Angle(D, A, E) → α
14. Angle(E, A, C) → β
15. Angle(C, B, E) → γ
16. Angle(E, B, D) → δ
17. Angle(E, D, A) → ε
18. Angle(A, C, E) → ζ
19. Angle(A, E, D) → η