菱形的性质 by karabarmaths

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → O
2. Circle(O, r) → c
3. Circle(O, r - a) → d
4. Point(d) → A
5. Line(A, O) → b
6. Intersect(d, b) → C_1, C
7. OrthogonalLine(O, b) → e
8. Intersect(c, e) → D, B
9. Polygon(A, B, C, D) → P, a_1, b_1, c_1, d_1
10. Segment(A, O) → f
11. Segment(O, C) → g
12. Segment(O, B) → h
13. Segment(O, D) → i
14. Angle(B, O, A) → α
15. Angle(D, A, B) → β
16. Angle(B, C, D) → γ
17. Angle(A, B, D) → δ
18. Angle(C, D, B) → ε
19. Angle(C, D, A) → ζ
20. Angle(A, B, C) → η
21. Angle(A, B, D) → θ
22. Angle(D, B, C) → ι
23. Angle(B, A, C) → κ
24. Angle(D, A, C) → λ