旋转法绘制正方形

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → A
2. Point(xAxis) → B
3. Segment(A, B) → f
4. Segment(C, A) → g
5. Segment(C, D) → h
6. Segment(D, B) → i
7. Rotate(A, (-a), B) → A'
8. Rotate(B, (-a), B) → B'
9. Segment(A', B') → f'
10. Rotate(D, a - 90°, D) → D'
11. Rotate(D, (-(a - 90°)), D) → D'_{1}
12. Rotate(B, (-(a - 90°)), D) → B'_{1}
13. Segment(D'_{1}, B'_{1}) → i'
14. Rotate(C, (-(a - 180°)), C) → C'
15. Rotate(D, (-(a - 180°)), C) → D'_{2}
16. Segment(C', D'_{2}) → h'
17. Rotate(C, (-(a - 270°)), A) → C'_{1}
18. Rotate(A, (-(a - 270°)), A) → A'_{1}
19. Segment(C'_{1}, A'_{1}) → g'
20. If(0° < a ≤ 90°, 1, 90° < a ≤ 180°, 2, 180° < a ≤ 270°, 3, 270° < a ≤ 360°, 4, 0) → visibility
21. Segment(A, B) → j