相似三角形中的余弦定律与勾股定理

GeoGebra 命令及参数

1. Polygon(A, B, C) → t1, c, a, b
2. Line(D, xAxis) → f
3. Circle(D, (c * c)) → d
4. Intersect(d, f, 2) → E
5. Circle(E, (a * c)) → g
6. Circle(D, (b * c)) → e
7. Intersect(g, e, 2) → F
8. Segment(E, F) → h
9. Segment(D, F) → i
10. Segment(D, E) → j
11. Circle(F, (b * b)) → k
12. Circle(D, (a * b)) → p
13. Intersect(k, p, 2) → G
14. Segment(D, G) → l
15. Segment(G, F) → m
16. Circle(F, (a * a)) → q
17. Circle(E, (a * b)) → r
18. Intersect(q, r, 1) → H
19. Segment(F, H) → n
20. Segment(H, E) → s
21. Line(C, xAxis) → t
22. OrthogonalLine(C, xAxis) → f_1
23. Angle(A, C, B) → α
24. Angle(D, G, F) → β
25. Angle(D, F, E) → γ
26. Angle(F, H, E) → δ
27. Angle(B, A, C) → ε
28. Angle(G, F, D) → ζ
29. Angle(E, D, F) → η
30. Angle(H, E, F) → θ
31. Angle(C, B, A) → ι
32. Angle(F, D, G) → κ
33. Angle(F, E, D) → λ
34. Angle(E, F, H) → μ