正多边形的对称性与旋转

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → A
2. Point(yAxis) → B
3. Circle(A, B) → c
4. Point(c) → C
5. Sequence(Rotate[C, ((i * 2) * pi / n), A], i, 1, n) → vert
6. Polygon(vert) → poly1
7. Rotate(C, rot, A) → C'
8. Line(C', A) → f
9. Mirror(poly1, f) → poly1'
10. Vertex(poly1) → D, E, F, G, H, D_{1}, D_{2}, D_{3}
11. Vertex(poly1') → I, J, K, L, M, N, P, Q
12. Point(f) → O
13. Circle(A, O) → d
14. Mirror(O, A) → O'
15. Segment(O', O) → g
16. Center(c) → CT