旋转对称 - 正方形

GeoGebra 命令及参数

1. Circle(A, B) → c
2. Point(c) → C
3. Line(A, C) → f
4. OrthogonalLine(A, f) → g
5. Intersect(c, g, 2) → D
6. Polygon(C, D, 4) → poly1, h, i, j, k, E, F
7. Circle(E, Segment[A, E]) → d
8. Circle(F, Segment[A, F]) → e
9. Intersect(d, e, 2) → G
10. Segment(A, G) → l
11. Intersect(c, l, 1) → H
12. Segment(B, A) → m
13. OrthogonalLine(A, m) → n
14. Intersect(c, n, 1) → I
15. Angle(H, A, I) → α
16. Rotate(B, (-(135°)), A) → B'
17. Angle(B', A, B) → β
18. Rotate(B, (-(45°)), A) → B'_1
19. Angle(B'_1, A, B) → γ
20. Polygon(B', B'_1, 4) → poly2, p, q, r, s, J, K