单位圆上的锐角与钝角关系

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. Point(e) → H
18. Point(a) → I
19. Angle(X_1, O, P_1) → ε
20. Angle(X_2, O, P_2) → ζ