平行四边形定理演示 by audrey.feldman

GeoGebra 命令及参数

1. Segment(B, C) → a
2. Segment(C, D) → b
3. Line(D, a) → c
4. Line(B, b) → d
5. Intersect(c, d) → A
6. Segment(B, A) → e
7. Segment(A, D) → f
8. Distance(B, C) → distanceAB
9. Distance(C, D) → distanceBC
10. Distance(D, A) → distanceCD
11. Distance(A, B) → distanceDA
12. Polygon(A, D, C, B) → poly1, d_1, c_1, b_1, a_1
13. Angle(poly1) → α, β, γ, δ
14. Slope(a) → m
15. Slope(f) → m_1
16. Slope(e) → m_2
17. Slope(b) → m_3