正弦加法定理 by Malin Christersson

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → A
2. Point(xAxis) → B
3. Rotate(B, β, A) → B'
4. Segment(B', A) → a_2
5. Rotate(B', α, A) → B''
6. OrthogonalLine(B'', xAxis) → j
7. OrthogonalLine(B'', a_2) → d
8. Intersect(d, a_2) → C
9. OrthogonalLine(C, yAxis) → m
10. Intersect(m, j) → E
11. Circle(A, B) → c_2
12. Angle(B, A, B') → γ
13. Angle(B', A, B'') → δ
14. Polygon(A, C, B'') → poly1, b'', a_1, c_1
15. Angle(B'', C, A) → ε
16. OrthogonalLine(C, xAxis) → f
17. OrthogonalLine(B'', yAxis) → g
18. Intersect(f, g) → D
19. Angle(D, C, B'') → ζ
20. Angle(E, C, B'') → η
21. Angle(D, C, B'') → θ
22. Angle(E, C, B'') → ι
23. Segment(D, B'') → e
24. Segment(E, C) → h
25. Midpoint(B'', C) → F
26. Midpoint(C, A) → G
27. Vector(C', C) → u
28. Vector(C, D) → v
29. Vector(E, B'') → w
30. Vector(A, P) → z