梯形面积动态演示 by Aleksandra-Maria Vuković

GeoGebra 命令及参数

1. Line(A, xAxis) → a
2. Point(a) → B
3. Line(C, a) → b
4. Point(b) → D
5. Polygon(A, B, C, D) → mnogokut1, a_1, b_1, c, d
6. Midpoint(b_1) → P
7. Rotate(A, -α, P) → A'
8. Rotate(B, -α, P) → B'
9. Rotate(C, -α, P) → C'
10. Rotate(D, -α, P) → D'
11. Polygon(A', B', C', D') → mnogokut1', a', b', c', d'
12. OrthogonalLine(D, a) → e
13. Intersect(a, e) → N
14. Angle(e, a) → β
15. Segment(D, N) → f
16. Segment(N, A) → g
17. Segment(A, C) → h
18. Segment(B, D) → i
19. Intersect(h, i) → E
20. Segment(C, D') → j
21. Segment(B, A') → k
22. Intersect(j, k) → F