旋转对称 by GeoGebra Institute of Hong Kong

GeoGebra 命令及参数

1. Sequence(Rotate[A, i°], i, 1, 360) → list1
2. Circle(O, A) → k
3. Point(list1) → B
4. Angle(A, O, B) → α
5. Rotate(pic1, α, O) → pic1'
6. Rotate(pic2, α, O) → pic2'
7. Rotate(pic3, α, O) → pic3'
8. Rotate(pic4, α, O) → pic4'
9. Rotate(pic5, α, O) → pic5'
10. Rotate(pic6, α, O) → pic6'
11. Rotate(pic7, α, O) → pic7'
12. Rotate(pic8, α, O) → pic8'
13. Rotate(pic9, α, O) → pic9'
14. Segment(O, A) → j
15. Segment(O, B) → l
16. If(e, 180°, If[b ∨ c ∨ i, 90°, If[a, 72°, 0°]]) → matchAngle