圆的周长 by Irina Boyadzhiev

GeoGebra 命令及参数

1. Ray((0, 0), (0, 1)) → pos
2. Point(pos) → D
3. Segment(A, D) → d_1
4. UnitVector(xAxis) → u
5. Segment(P_2, Q_2) → d
6. Segment(R, C) → a
7. Point(a) → O
8. Circle(O, r) → c
9. Circle(O, r) → c_1
10. Circumference(c_1) → CC
11. Intersect(c, xAxis) → T, B
12. Segment(A, T) → dist
13. Rotate(T, (-α), O) → T'
14. Segment(P, Q) → b
15. Midpoint(P, Q) → M
16. UnitVector(yAxis) → u_1
17. Segment(P_1, Q_1) → b_1
18. Vector(Q_1, T) → w_1
19. Midpoint(P_1, Q_1) → M_1
20. Vector(Q_2, R) → e
21. Midpoint(d) → M_2
22. Translate(Q, Vector[((2.4 * g) * u)]) → Q'
23. Translate(P, Vector[((2.4 * g) * u)]) → P'
24. Segment(P', Q') → b'
25. Rotate(A, (-3.141592653589793 * (g - 1)), A) → A'_1
26. Rotate(D, ((-(3.141592653589793 / 2)) * (g - 1)), A) → D'
27. Segment(A'_1, D') → f
28. Segment(A, A + (b * u)) → f_1
29. Rotate(A, (-3.141592653589793 * (g - 2)), A + (b * u)) → A'
30. Rotate(A + (b * u), (-3.141592653589793 * (g - 2)), A + (b * u)) → E
31. Segment(A', E) → h
32. Segment(A + (b * u), A + ((2 * b) * u)) → f_2
33. Rotate(A + (b * u), (-3.141592653589793 * (g - 3)), A + ((2 * b) * u)) → F
34. Rotate(A + ((2 * b) * u), (-3.141592653589793 * (g - 3)), A + ((2 * b) * u)) → G
35. Segment(F, G) → f_3
36. Segment(T', O) → i
37. Segment(O, T) → j
38. Arc(c, T, T') → color
39. Angle(T', O, T) → β
40. Segment(P_1, A) → v_1
41. Segment(P, A) → v
42. Segment(P_2, A) → z
43. Segment(Q, D) → w