双切线构造演示

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → O
2. Circle(O, r) → c
3. Point(Circle[O, d]) → P
4. Segment(O, P) → f
5. Point({f / 2 + 1, 0}) → A
6. Circle(O, Segment[A, O]) → e
7. Circle(P, Segment[A, O]) → g
8. Intersect(e, g, 1) → B
9. Intersect(e, g, 2) → C
10. Segment(B, C) → h
11. Point(g) → D
12. Point(g) → E
13. CircleArc(P, D, E) → k
14. Point(g) → F
15. Point(g) → G
16. CircleArc(P, F, G) → p
17. Point(e) → H
18. Point(e) → I
19. CircleArc(O, H, I) → q
20. Point(e) → J
21. Point(e) → K
22. CircleArc(O, J, K) → s
23. Midpoint(B, C) → M
24. Circle(M, Segment[M, O]) → t
25. Intersect(c, t) → T, T', ,
26. Segment(T, P) → i
27. Segment(P, T') → j
28. Circle(P, 0) → c_1
29. Segment(O, T) → l
30. Segment(O, T') → m
31. Textfield(r) → InputBox1
32. Textfield(d) → InputBox2
33. Distance(P, T) → distancePT
34. Distance(P, T') → distancePT'
35. Angle(O, T, P) → α
36. Angle(P, T', O) → β
37. Distance(O, T) → distanceOT
38. Distance(O, T') → distanceOT'
39. Circle(O, r) → d_1