探索单位圆的坐标

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → O
2. Circle(O, 1) → c
3. Rotate(A, α, O) → P
4. Sequence(Rotate[A, ((90 * k) + 30)°, O], k, 0, 3) → list1
5. Sequence(Rotate[A, ((90 * k) + 45)°, O], k, 0, 3) → list2
6. Sequence(Rotate[A, ((90 * k) + 60)°, O], k, 0, 3) → list3
7. Segment(A, C) → a
8. Segment(B, D) → b
9. Sequence(Segment[O, Element[list1, k]], k, 1, 4) → list4
10. Sequence(Segment[O, Element[list2, k]], k, 1, 4) → list5
11. Sequence(Segment[O, Element[list3, k]], k, 1, 4) → list6
12. Angle(A, O, P) → θ
13. CircleArc(O, A, P) → l
14. Circle(O, 1) → d
15. OrthogonalLine(P, a) → e
16. Intersect(e, a) → E
17. Distance(O, E) → distanceOE
18. Distance(P, E) → distancePE
19. Segment(P, E) → f
20. Segment(O, E) → g
21. Distance(P, E) → h
22. Distance(O, E) → i
23. Distance(O, E) → j
24. Midpoint(O, E) →