几何作图范例：基于点线圆与角的平面图形构造演示

GeoGebra 命令及参数

1. Angle(A, B, C) → α
2. Segment(A, B) → a
3. Segment(B, C) → b
4. Segment(D, E) → c
5. Segment(F, G) → d
6. Segment(H, I) → e
7. Point(e) → J
8. Segment(H_1, I_1) → e_1
9. Circle(L, N) → f