单位圆与三角函数 by Gary Rubinstein

GeoGebra 命令及参数

1. Circle(Point[{0, 0}], 1) → c
2. Point(c) → A
3. Point({0, 0}) → B
4. Point({1, 0}) → C
5. Angle(C, B, A) → Θ
6. Point({-1, 0}) → D
7. Angle(A, B, D) → α_2
8. Angle(D, B, A) → α_3
9. Angle(A, B, C) → α_4
10. Segment(B, A) → a
11. LaTeX(Θ, true, true) → text1
12. LaTeX(α_2, true, true) → text2
13. LaTeX(α_3, true, true) → text3
14. LaTeX(α_4, true, true) → text4