动画76：圆与变换

GeoGebra 命令及参数

1. Circle(A, B) → c
2. Point(c) → C
3. Segment(A, B) → a
4. Circle(D, a) → d
5. Point(d) → E
6. Point(c) → F
7. Segment(F, C) → b
8. Point(c) → G
9. Circle(G, b) → e
10. Intersect(c, e, 1) → H
11. Segment(G, H) → f
12. Circle(E, b) → g
13. Intersect(d, g, 2) → I
14. Segment(E, I) → h
15. Angle(F, A, C) → α
16. Rotate(F, If[0 < i ≤ 1, (i * α), α], A) → F'
17. CircleArc(A, F, F') → k
18. Angle(G, A, F) → β
19. Segment(E, I) → j
20. Rotate(k, If[1.5 < i ≤ 2.5, ((-(i - 1.5)) * β), (-β)], A) → k'
21. CircleArc(A, F, C) → p
22. Dilate(H, If[2.6 < i ≤ 3.6, 3.6 - i, 0], E) → H'
23. Vector(H, H') → u
24. Translate(k', u) → k''
25. Line(E, f) → l
26. Point(l) → J
27. Angle(I, E, J) → γ
28. Rotate(k'', If[3.6 < i ≤ 4.6, ((-(i - 3.6)) * (γ + 180°)), (-(γ + 180°))], E) → k'''
29. Segment(A, B) → m
30. Point(d) → K
31. Segment(D, K) → n