单位圆中的三角学与相似性

GeoGebra 命令及参数

1. Circle(O, 1) → c
2. Point(c) → S
3. Line(O, S) → a
4. OrthogonalLine(O, a) → b
5. OrthogonalLine(S, a) → d
6. Intersect(c, b, 2) → U
7. OrthogonalLine(U, b) → e
8. Point(c) → P
9. Line(O, P) → f
10. Intersect(e, f) → T
11. Intersect(d, f) → R
12. Segment(U, T) → g
13. Segment(O, T) → h
14. Segment(O, R) → i
15. Segment(S, R) → j
16. Angle(S, O, P) → t
17. OrthogonalLine(P, a) → k
18. Intersect(a, k) → Q
19. Segment(Q, P) → l
20. Point(a) → A
21. Point(a) → B
22. Segment(B, A) → m
23. Point(b) → C
24. Point(b) → D
25. Segment(C, D) → n