计算圆形面积的方法

GeoGebra 命令及参数

1. Segment(A, B) → a
2. Segment(A, C) → b
3. Line(C, a) → c
4. Line(B, b) → d
5. Intersect(d, c) → D
6. Polygon(A, C, D, B) → P, a_1, c_1, d_1, b_1
7. OrthogonalLine(C, a) → e
8. Intersect(e, b_1) → E
9. Polygon(C, E, A) → Q, a_2, c_2, e_1
10. Circle(A, g) → h
11. Intersect(h, b_1) → F, G
12. Vector(A, F) → u
13. Translate(C, u) → C'
14. Translate(E, u) → E'
15. Translate(A, u) → A'
16. Polygon(C', E', A') → Q', a', c', e'
17. Polygon(C, E, B, D) → R, c_3, e_2, b_2, d_2
18. OrthogonalLine(D, b_1) → i
19. Intersect(b_1, i) → H
20. Polygon(C, D, H, A) → S, c_4, d_3, h_1, a_3
21. Polygon(D, H, B) → T, b_3, d_4, h_2
22. Translate(D, Vector[(-u)]) → D'
23. Translate(H, Vector[(-u)]) → H'
24. Translate(B, Vector[(-u)]) → B'
25. Polygon(D', H', B') → T', b', d', h'