三角形的外接圆 by user670

GeoGebra 命令及参数

1. Segment(A, B) → a
2. Segment(A, C) → b
3. Segment(C, B) → c
4. Polygon(A, B, C) → poly1, c_1, a_1, b_1
5. Angle(C, B, A) → α
6. Angle(B, A, C) → β
7. Angle(A, C, B) → γ
8. Midpoint(A, B) → D
9. Midpoint(B, C) → E
10. Midpoint(C, A) → F
11. OrthogonalLine(D, a) → d
12. OrthogonalLine(F, b) → e
13. OrthogonalLine(E, c) → f
14. Intersect(d, e) → M
15. Circle(M, B) → g