三角函数比值动态演示：直角三角形边比与角度关系

GeoGebra 命令及参数

1. Line(A, B) → f
2. OrthogonalLine(A, f) → g
3. Point(g) → C
4. Polygon(A, B, C) → poly1, AB, BC, AC
5. Dilate(A, 0.5, D) → A'
6. Dilate(B, 0.5, D) → B'
7. Dilate(C, 0.5, D) → C'
8. Polygon(A', B', C') → poly1', A'B', B'C', A'C'
9. Angle(poly1) → α, β, γ
10. Angle(poly1') → δ, ε, ζ
11. Distance(C', B') → C'B'