四边形的旋转对称性

GeoGebra 命令及参数

1. Polygon(A, B, C, D) → poly1, a, b, c, d
2. Midpoint(A, B) → E
3. Midpoint(B, C) → F
4. Midpoint(C, D) → G
5. Midpoint(D, A) → H
6. Segment(A, C) → e
7. Segment(B, D) → f
8. Segment(E, G) → g
9. Segment(F, H) → h
10. Line(A, C) → i
11. Line(B, D) → k
12. Line(E, G) → l
13. Line(F, H) → m
14. Point(m) → J
15. Ray(I, J) → j
16. Rotate(A', α, I) → A''
17. Rotate(B', α, I) → B''
18. Rotate(C', α, I) → C''
19. Rotate(D', α, I) → D''
20. Polygon(A', B', C', D') → poly1'', n, p, q, r
21. Polygon(C'', B'', A'', D'') → q1, c'', b'', a'', d''