圆内接多边形习题：半圆定理 by Jose Arturo Gomez Velasquez

GeoGebra 命令及参数

1. Intersect(xAxis, yAxis) → O
2. Circle(O, 10) → circle
3. Intersect(circle, xAxis, 1) → A
4. Intersect(circle, xAxis, 2) → B
5. Point(Circle[O, 10]) → C
6. Segment(A, C) → b_2
7. Segment(O, A) → c
8. Segment(O, B) → d
9. Segment(B, C) → e
10. Angle(C, B, O) → α
11. Angle(O, A, C) → β_1
12. Angle(C, B, O) → λ
13. Angle(A, C, B) → γ
14. Angle(A, C, B) → δ
15. Angle(O, A, C) → β
16. Angle(C, B, O) → ε
17. Angle(O, A, C) → ζ
18. Rotate(O, 70*°, A) → O'
19. Ray(A, O') → a
20. Intersect(circle, a, 2) → D
21. Polygon(A, B, C) → polígono1, c_1, a_1, b
22. Vector(E, C) → u