三角比比较：几何与三角函数的直观演示

GeoGebra 命令及参数

1. Point(c) → A
2. Point(c) → B
3. Segment(A_1, A) → a
4. Segment(A_1, B) → b
5. OrthogonalLine(A, xAxis) → d
6. OrthogonalLine(B, xAxis) → e
7. Intersect(e, xAxis) → D
8. Intersect(d, xAxis) → E
9. Polygon(A_1, A, E) → poly1, e_1, a_1, b_1
10. Polygon(A_1, B, D) → poly2, d_1, a_2, c_1
11. Angle(A, E, A_1) → α
12. Angle(B, D, A_1) → β