菱形面积计算方法演示

GeoGebra 命令及参数

1. Segment(A, B) → AB
2. Circle(A, B) → c
3. Point(c) → C
4. Segment(A, C) → AC
5. Line(B, AC) → h
6. Line(C, AB) → i
7. Intersect(h, i) → D
8. Segment(C, D) → CD
9. Segment(B, D) → BD
10. Polygon(A, B, D, C) → poly1, a, b, d, c_1
11. OrthogonalLine(C, CD) → f
12. Intersect(f, AB) → C'
13. OrthogonalLine(B, AB) → g
14. Intersect(g, CD) → D'
15. Segment(D', B) → Altitude_2
16. Segment(C', C) → Altitude_1
17. Line(D, Altitude_2) → j
18. Line(B, CD) → k
19. Intersect(j, k) → A'
20. Segment(B, A') → TranslatedAC'
21. Segment(D, A') → TranslatedCC'
22. Segment(A, C') → AC'
23. Polygon(C, C', A', D) → poly2, c_2, c', a', d_1
24. Angle(C, D, B) → α
25. Angle(B, A, C) → β
26. Angle(A, C, D) → γ
27. Angle(D, B, A) → δ