平行四边形中角的关系探究

GeoGebra 命令及参数

1. Segment(A, B) → f
2. Segment(A, C) → g
3. Line(C, f) → h
4. Line(B, g) → i
5. Intersect(h, i) → D
6. Segment(C, D) → j
7. Segment(D, B) → k
8. Angle(Translate[A, vec1], Translate[C, vec1], Translate[D, vec1]) → α
9. Line(C, A) → l
10. Point(l) → E
11. Angle(Translate[E, vec2], Translate[A, vec2], Translate[B, vec2]) → β
12. Angle(Rotate[D, ((3 - a) * π), B], B, Rotate[A, ((3 - a) * π), B]) → γ
13. Angle(Translate[B, vec3], Translate[A, vec3], Translate[C, vec3]) → δ
14. Line(A, B) → m
15. Point(m) → F
16. Angle(Translate[F, vec4], Translate[B, vec4], Translate[D, vec4]) → ε
17. Angle(Rotate[C, ((3 - a) * π), D], D, Rotate[B, ((3 - a) * π), D]) → ζ