动态演示梯形面积

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. OrthogonalLine(D, a) → e
7. Intersect(a, e) → N
8. Segment(D, N) → f
9. Segment(N, A) → g
10. Angle(e, a) → α
11. Midpoint(b_1) → P
12. Polygon(D, P, C) → mnogokut2, c_1, d_1, p
13. Circle(B, c) → h
14. Intersect(h, a, 2) → E
15. Rotate(D, -β, P) → D'
16. Rotate(P, -β, P) → P'
17. Rotate(C, -β, P) → C'
18. Polygon(D', P', C') → mnogokut2', c', d', p'
19. Polygon(A, B, P, D) → mnogokut3, a_2, b_2, p_1, d_2
20. Segment(D, C) → i
21. Segment(C, P) → j
22. Midpoint(p_1) → F
23. Midpoint(d') → G