对称轴 by Alex Kemphaus

GeoGebra 命令及参数

1. Line(A, B) → f
2. Line(C, f) → g
3. OrthogonalLine(A, f) → h
4. OrthogonalLine(B, f) → i
5. Intersect(g, h) → D
6. Intersect(g, i) → E
7. Polygon(A, B, E, D) → q1, a, b, e, d
8. Midpoint(a) → F
9. Midpoint(b) → G
10. Midpoint(e) → H
11. Midpoint(d) → I
12. Line(I, G) → j
13. Mirror(A, j) → A'
14. Mirror(B, j) → B'
15. Mirror(E, j) → E'
16. Mirror(D, j) → D'
17. Polygon(A', B', E', D') → q1', a', b', e', d'