旋转变换中的角度和性质

GeoGebra 命令及参数

1. Polygon(A, B, C) → poly1, c, a, b
2. Midpoint(c) → D
3. Midpoint(b) → E
4. Rotate(A, (-α), E) → A'
5. Rotate(B, (-α), E) → B'
6. Rotate(C, (-α), E) → C'
7. Polygon(A', B', C') → poly1', c', a', b'
8. Rotate(A, β, D) → A'_1
9. Rotate(B, β, D) → B'_1
10. Rotate(C, β, D) → C'_1
11. Polygon(A'_1, B'_1, C'_1) → poly1'_1, c'_1, a'_1, b'_1
12. Angle(poly1) → γ, δ, ε
13. Angle(poly1'_1) → ζ, η, θ
14. Angle(poly1') → ι, κ, λ