三角形与梯形中线探究

GeoGebra 命令及参数

1. Polygon(A, B, C) → poly1, c, a, b
2. Midpoint(c) → D
3. Midpoint(b) → E
4. Segment(D, E) → d
5. Angle(A, E, D) → α
6. Angle(E, C, B) → β
7. Angle(C, B, D) → γ
8. Angle(E, D, A) → δ
9. Midpoint(a) → J
10. Segment(J, E) → e
11. Segment(J, D) → f
12. Distance(A, B) → distanceAB
13. Polygon(K, L, M) → poly2, m, k, l
14. Midpoint(l) → N
15. Midpoint(k) → O
16. Segment(N, O) → g
17. Angle(O, N, M) → ε
18. Angle(L, K, N) → ζ
19. Angle(M, O, N) → η
20. Angle(O, L, K) → θ