标准位置下的角度旋转

GeoGebra 命令及参数

1. CurveCartesian(((a * t) * cos(t)), ((a * t) * sin(t)), t, 0, (6 * π)) → c
2. CurveCartesian(x(A), y(A), w, 0, (6 * π)) → b
3. Segment(B, A) → g
4. Circle(B, g) → d
5. Intersect(d, y = 0) → C, D
6. CircleArc(B, D, A) → e
7. Angle(D, B, A) → α
8. CurveCartesian(((a * t) * cos(t)), ((a * t) * sin(t)), t, 0, w) → h
9. Circle(B, (1.25 * g)) → k
10. Ray(B, A) → l
11. Intersect(k, l, 1) → E
12. Vector(B, E) → u
13. Intersect(k, y = 0) → F, G
14. Vector(B, G) → v_1
15. Mirror(h, y = 0) → h'
16. Mirror(E, y = 0) → E'
17. Vector(B, E') → v
18. Vector(B, H) → q