利用单位圆探究象限角关系

GeoGebra 命令及参数

1. Point(c) → A
2. Point(c) → B
3. Point(c) → C
4. Point(c) → D
5. Arc(c, A, B) → quad1
6. Point(quad1) → P_1
7. Intersect(xAxis, yAxis) → E
8. Segment(P_1, E) → a
9. Angle(P_1, E, A) → α
10. Segment(P_1, Y_1) → b
11. Segment(P_1, X_1) → d
12. Arc(c, B, C) → quad2
13. Segment(P_2, E) → e
14. Angle(A, E, P_2) → β
15. Segment(P_2, X_2) → f
16. Segment(P_2, Y_2) → g
17. Arc(c, C, D) → quad3
18. Segment(P_3, X_3) → h
19. Segment(P_3, Y_3) → i
20. Segment(P_3, E) → j
21. Angle(A, E, P_3) → γ
22. Arc(c, D, A) → quad4
23. Segment(P_4, X_4) → k
24. Segment(P_4, Y_4) → l
25. Segment(P_4, E) → m
26. Angle(A, E, P_4) → δ
27. Point(m) → F
28. Point(j) → G
29. Point(e) → H
30. Point(a) → I
31. Angle(X_1, O, P_1) → ε
32. Angle(X_2, O, P_2) → ζ
33. Angle(X_2, O, P_3) → η
34. Angle(X_1, O, P_4) → θ