探索圆周角

GeoGebra 命令及参数

1. Circle(A, 3) → p
2. Point(p) → K
3. Point(p) → B
4. CircleArc(A, K, B) → r
5. Line(B, A) → a
6. Point(r) → C
7. Line(A, C) → b
8. Circle(A, B) → c
9. Intersect(c, a, 2) → D
10. Intersect(c, b, 1) → E
11. Angle(K, A, C) → α
12. Ray(A, K) → d
13. Ray(A, C) → e
14. Ray(A, B) → k
15. Angle(C, A, B) → γ
16. CircleArc(A, B, K) → q
17. Angle(B, A, K) → β
18. Text(("γ = " * gamma_k)) → gammaktext