相似多边形与缩放因子

GeoGebra 命令及参数

1. Point(xAxis) → A
2. Point(xAxis) → D
3. Polygon(A, B, C, D) → poly1, a, b, c, d
4. Intersect(xAxis, yAxis) → E
5. Vector(D, E) → u
6. Translate(A, u) → A1
7. Translate(B, u) → B1
8. Translate(C, u) → C1
9. Translate(D, u) → D1
10. Polygon(A1, B1, C1, D1) → poly1', a', b', c', d'
11. Dilate(A1, ScaleFactor, E) → A'
12. Dilate(B1, ScaleFactor, E) → B'
13. Dilate(C1, ScaleFactor, E) → C'
14. Dilate(D1, ScaleFactor, E) → D'
15. Polygon(A', B', C', D') → poly1'', a'', b'', c'', d''
16. Angle(poly1) → α, β, γ, δ
17. Angle(poly1'') → ε, ζ, η, θ