两个反射

GeoGebra 命令及参数

1. Line(D, E) → a
2. Line(F, G) → b
3. Polygon(A, B, C) → poly1, g, e, f
4. Mirror(A, a) → A'
5. Mirror(B, a) → B'
6. Mirror(C, a) → C'
7. Polygon(A', B', C') → poly1', g', e', f'
8. Mirror(A', b) → A''
9. Mirror(B', b) → B''
10. Mirror(C', b) → C''
11. Polygon(A'', B'', C'') → poly1'', g'', e'', f''
12. Intersect(b, a) → O
13. Segment(O, B) → c
14. Segment(O, B'') → d
15. Segment(O, A) → h
16. Segment(O, A'') → i
17. Segment(O, B') → j
18. Segment(O, A') → k