圆弧与角的基本性质

GeoGebra 命令及参数

1. Circle(A, B) → c
2. Point(c) → C
3. Line(drag, C) → a
4. OrthogonalLine(C, a) → b
5. Circle(C, drag) → d
6. Intersect(d, b, 2) → E
7. Intersect(d, b, 1) → F
8. CircleArc(C, E, drag) → e
9. CircleArc(C, drag, F) → f
10. Point(e) → G
11. Point(f) → H
12. Line(G, C) → g
13. Line(H, C) → h
14. CircleArc(C, G, H) → k
15. Angle(G, C, H) → α
16. Intersect(c, g, 2) → I
17. Intersect(c, h, 2) → J
18. Intersect(c, a, 2) → K
19. CircumcircleArc(I, K, J) → p
20. OrthogonalLine(G, g) → i
21. Point(i) → D
22. Vector(D, G) → u
23. OrthogonalLine(H, h) → j
24. Point(j) → L
25. Vector(L, H) → v
26. Segment(I, A) → l
27. Segment(A, J) → m
28. Angle(I, A, J) → β