多边形内角和性质

GeoGebra 命令及参数

1. Polygon(A, B, C, D) → q1, a, b, c, d
2. Angle(D, A, B) → α
3. Angle(B, C, D) → β
4. Angle(C, D, A) → γ
5. Angle(A, B, C) → δ
6. Polygon(E, F, G, H, I) → poly1, e, f, g, h, i
7. Angle(H, I, E) → ε
8. Angle(I, E, F) → ζ
9. Angle(F, G, H) → η
10. Angle(G, H, I) → θ
11. Angle(E, F, G) → ι
12. Segment(B, D) → j
13. Segment(E, G) → k
14. Segment(I, G) → l