等边对边四边形的构造

GeoGebra 命令及参数

1. Point(Circle[A, abs(r)]) → B
2. Segment(A, B) → c
3. Point(Circle[C, abs(r)]) → D
4. Segment(C, D) → d
5. Point(Circle[E, abs(b)]) → F
6. Segment(E, F) → e
7. Point(Circle[G, abs(b)]) → H
8. Segment(G, H) → f
9. Line(C, D) → g
10. Line(F, E) → h
11. Angle(F, E, I) → α
12. RotateText(text1, (-α) + 90°) → text2
13. Angle(B, A, J) → β
14. RotateText(text1, (-β)) → text4