平行四边形的性质探索活动

GeoGebra 命令及参数

1. Line(A, B) → a
2. Line(A, C) → b
3. Line(C, a) → c
4. Line(B, b) → d
5. Intersect(c, d) → D
6. Segment(A, B) → AB
7. Segment(B, D) → BD
8. Segment(D, C) → CD
9. Segment(C, A) → AC
10. Angle(D, B, A) → ABD
11. Angle(C, D, B) → CDB
12. Angle(A, C, D) → ACD
13. Angle(B, A, C) → BAC
14. Segment(A, D) → AD
15. Segment(B, C) → BC
16. Intersect(AD, BC) → E
17. Segment(A, E) → AE
18. Segment(E, D) → DE
19. Segment(C, E) → CE
20. Segment(E, B) → BE