正弦定理几何证明动态演示

GeoGebra 命令及参数

1. Point(xAxis) → A
2. Point(xAxis) → C
3. Segment(A, C) → b
4. Segment(C, B) → a
5. Segment(B, A) → c
6. OrthogonalLine(B, xAxis) → d
7. Intersect(d, b) → D
8. Segment(A, D) → e
9. Segment(D, C) → f
10. Segment(D, B) → h
11. OrthogonalLine(A, a) → h_1
12. OrthogonalLine(B, h_1) → i
13. Intersect(h_1, i) → E
14. Segment(E, B) → j
15. Segment(E, A) → k
16. Angle(B, D, A) → β
17. Polygon(A, D, B) → poly1, b_1, a_1, d_1
18. Polygon(B, D, C) → poly2, c_1, b_2, d_2
19. Angle(B, E, A) → α
20. Polygon(B, E, A) → poly3, a_2, b_3, e_1
21. Polygon(E, A, C) → poly4, c_2, e_2, a_3