旋转入门

GeoGebra 命令及参数

1. Polygon(A, B, C) → poly1, c, a, b
2. Rotate(A, (-α), D) → A'
3. Rotate(B, (-α), D) → B'
4. Rotate(C, (-α), D) → C'
5. Polygon(A', B', C') → poly1', c', a', b'
6. Segment(D, C) → d
7. Segment(D, C') → e
8. Circle(D, C) → f
9. Circle(D, B) → g
10. Circle(D, A) → h
11. Segment(D, B) → i
12. Segment(D, B') → j
13. Segment(D, A) → k
14. Segment(D, A') → l
15. Angle(A', D, A) → β
16. Angle(B', D, B) → γ
17. Angle(C', D, C) → δ