构造角 by Erell Germia

GeoGebra 命令及参数

1. Circle(A, 3) → e
2. Point(e) → E
3. Vector(F, E) → u
4. Circle(A, 4) → c
5. Point(c) → C
6. Vector(A, C) → a
7. Angle(u, a) → γ
8. Segment(A, C) → f
9. Circle(A, 2.5) → d
10. Point(u) → O
11. Point(a) → Q
12. Vector(R, S) → v
13. Line(A, yAxis) → i
14. Line(A, xAxis) → j
15. Intersect(d, j) → B, D
16. Intersect(d, i) → H, I
17. Segment(I, H) → k
18. Segment(D, B) → l
19. CircleSector(A, O, Q) → g
20. Polygon(G, J, 4) → poly1, n, p, r, s, K, L