标准位置的角

GeoGebra 命令及参数

1. Point(xAxis) → A_{1}
2. Point(xAxis) → B_{1}
3. Vector(A_{1}, B_{1}) → u
4. Rotate(u, 90°, A_{1}) → u'
5. Rotate(u', 90°, A_{1}) → u''
6. Rotate(u'', 90°, A_{1}) → u'''
7. Rotate(u, α, A_{1}) → u'_{1}
8. Circle(A_{1}, 5) → c
9. Point(c) → C
10. Segment(A_{1}, B_{1}) → f
11. Rotate(A_{1}, α, A_{1}) → A'
12. Rotate(B_{1}, α, A_{1}) → B'
13. Segment(A', B') → f'
14. Intersect(c, f', 1) → B
15. Intersect(c, f, 1) → A
16. Rotate(G, α, A_{1}) → G'
17. CircleArc(A_{1}, G, G') → d
18. Rotate(G', -20°, A_{1}) → G''
19. Vector(G'', G') → v
20. Midpoint(B', A_{1}) → D
21. Point(u) → E
22. Point(v) → F
23. Circle(A_{1}, 1) → e
24. Rotate(E, α / 2, A_{1}) → E'
25. Ray(A_{1}, E') → g
26. Intersect(e, g, 1) → H