直角三角形中的正弦余弦正切几何含义

GeoGebra 命令及参数

1. Polygon((0, 0), (x(A), 0), A) → t1, a, g, h
2. Angle(A, (x(A), 0), (0, 0)) → α
3. Angle((x(A), 0), (0, 0), A) → β
4. Segment((0, 0), A) → i
5. Segment((0, 0), (x(A), 0)) → k
6. Ray((0, 0), (1, 0)) → j
7. Ray((0, 0), (0, 1)) → l
8. RotateText(text2, (b * pi / 180)) → text3
9. Segment((x(A), 0), A) → n
10. RotateText(text4, ((-pi)) / 2) → text5
11. RotateText(text7, β) → text8
12. Rotate(k, If[0 < p ≤ 1, ((p * b) * pi / 180)], (0, 0)) → k'
13. Rotate(n, If[0 < p ≤ 1, ((-p) * (pi / 2 - (b * pi / 180)))], A) → n'
14. Rotate(n, If[0 < p ≤ 1, (p * pi / 2)], (x(A), 0)) → n'_{1}
15. RotateText(text9, β) → text11
16. RotateText(text14, (b * pi / 180)) → text15
17. CircleArc((0, 0), (v, 0), (0, v)) → d