圆面积计算演示

GeoGebra 命令及参数

1. If(s ≤ 1.5, 0, If[(1.5 < s) ∧ (s ≤ 2.5), s - 1.5, 1]) → s2
2. Intersect(yAxis, xAxis) → O
3. Circle(A, O) → c
4. Circumference(c) → z
5. If(s ≤ 5, 0, If[(5 < s) ∧ (s ≤ 6), s - 5, 1]) → s5
6. If(s ≤ 3, 0, If[(3 < s) ∧ (s ≤ 4), s - 3, 1]) → s3
7. If(s ≤ 4, 0, If[(4 < s) ∧ (s ≤ 5), s - 4, 1]) → s4
8. If(s ≤ 0, 0, If[(0 < s) ∧ (s ≤ 1), s, 1]) → s1
9. Textfield(A1) → dv1
10. Segment(O, M) → b
11. Circle(A, O) → d
12. Point(yAxis) → H
13. Vector(O, H) → z_1
14. Translate(M, z_1) → M'
15. Vector(H, M') → e
16. Vector(M', H) → t
17. Midpoint(H, M') → I
18. Vector(J, K) → h
19. Vector(K, J) → R
20. Segment(M', M) → j
21. Segment(H, O) → k
22. Segment(O, J) → l
23. Segment(A, K) → p
24. Midpoint(K, J) → P
25. If(s ≤ 6, 0, If[(6 < s) ∧ (s ≤ 7), s - 6, 1]) → s6
26. If(s ≤ 7, 0, If[(7 < s) ∧ (s ≤ 8), s - 7, 1]) → s7
27. Circle(A, O) → q
28. Sequence(Dilate[O, i / n, A], i, 0, n) → Li1
29. CircleArc(C, O, B) → s_1
30. Sequence(Dilate[B, i / n, A], i, 0, n) → Li2
31. Sequence(Dilate[C, i / n, A], i, 0, n) → Li3
32. Sequence(CircleArc[Element[Li3, i], Element[Li1, i], Element[Li2, i]], i, 1, n) → Li4
33. Sequence(Dilate[M, i / n, A], i, 0, n) → Li5
34. Sequence(Segment[Element[Li1, i], Element[Li5, i]], i, 1, n) → Li6
35. Segment(A, M) → r
36. CircleArc(C', O, B') → s_2
37. Sequence(Circle[A, Element[Li1, i]], i, 1, n) → Li7
38. Sequence(CircleArc[A, Rotate[Element[Li1, i], (((-360))° * s2), A], Element[Li1, i]], i, 1, n) → Li8