单位圆与三角函数演示

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → A_1
2. Circle(A_1, r) → c
3. Point(xAxis) → B
4. Rotate(B, α_1, A_1) → B'
5. Angle(B, A_1, B') → α
6. Segment(B', A_1) → a
7. Intersect(c, a, 1) → C
8. Segment(A_1, C) → b
9. OrthogonalLine(C, yAxis) → d
10. Intersect(d, yAxis) → O
11. OrthogonalLine(C, xAxis) → e
12. Intersect(e, xAxis) → A
13. OrthogonalLine(C, xAxis) → f
14. Intersect(f, xAxis) → D
15. Polygon(A_1, C, D) → poly1, d_1, a_1, c_1
16. OrthogonalLine(C, b) → g
17. Slope(g) → m
18. Line(A_1, C) → j
19. Intersect(c, xAxis, 2) → F
20. OrthogonalLine(F, xAxis) → k
21. Intersect(j, k) → G
22. Polygon(A_1, G, F) → poly2, f_1, a_2, g_1
23. Segment(G, F) → l