Steiner deltoid 参数化曲线演示

GeoGebra 命令及参数

1. DynamicCoordinates(A_1, round(x(A_1)), round(y(A_1))) → A
2. DynamicCoordinates(B_1, round(x(B_1)), round(y(B_1))) → B
3. DynamicCoordinates(C_1, round(x(C_1)), round(y(C_1))) → C
4. Polygon(A, B, C) → poly1, c', a', b'
5. Line(A, B) → a
6. Line(B, C) → b
7. Line(A, C) → c
8. Circle(A, B, C) → d
9. Point(d) → P
10. OrthogonalLine(P, a) → e
11. OrthogonalLine(P, c) → f
12. OrthogonalLine(P, b) → g
13. Intersect(b, g) → E
14. Intersect(a, e) → F
15. Intersect(f, c) → G
16. Line(G, F) → h
17. Line(E, F) → i
18. Segment(P, F) → j
19. Segment(P, E) → k
20. Segment(P, G) → l
21. Angle(P, F, B) → α
22. Angle(P, E, C) → β
23. Angle(P, G, C) → γ
24. Envelope(i, P) → m