直角三角形的锐角

GeoGebra 命令及参数

1. Line(A, B) → f
2. OrthogonalLine(B, f) → g
3. Circle(B, 1) → c
4. Intersect(c, g, 2) → C
5. Ray(B, C) → h
6. Point(h) → D
7. Polygon(A, B, D) → poly1, d, a, b
8. Segment(A, B) → i
9. Segment(B, D) → j
10. Segment(D, A) → k
11. Angle(D, B, A) → α
12. Min(j, i) → e
13. Circle(D, (0.2 * e)) → p
14. Circle(A, (0.2 * e)) → q
15. Intersect(p, k, 1) → E
16. Intersect(p, j, 1) → F
17. Intersect(q, i, 1) → G
18. Intersect(q, k, 1) → H
19. CircleSector(D, E, F) → r
20. CircleSector(A, G, H) → s
21. Dilate(D, If[0 < l ≤ 1, 1 - l, 0], B) → D'
22. Vector(D, D') → u
23. Translate(r, u) → r'
24. Angle(E, D, F) → β
25. Angle(G, A, H) → γ
26. Rotate(r', If[1 < l ≤ 2, ((-(l - 1)) * (π / 2 + γ)), (-(π / 2 + γ))], B) → r''
27. Circle(A, 1) → t
28. Rotate(s, If[2 < l ≤ 3, ((l - 2) * (π - γ)), π - γ], A) → s'
29. Dilate(A, If[3 < l ≤ 4, 4 - l, 0], B) → A'
30. Vector(A, A') → v
31. Translate(s', v) → s''
32. CircleArc(A, G, H) → c_1
33. CircleArc(D, E, F) → d_1