概率维恩图：圆

GeoGebra 命令及参数

1. Line(A, B) → c
2. Circle(C, r1) → g
3. Circle(D, r2) → e
4. Segment(C, D) → dist
5. If(x(D) - x(C) ≤ r1 - r2, Min[a, b], r1^(2) * θ + r2^(2) * α - h * ((r1^(2) - h^(2))^(0.5) + (r2^(2) - h^(2))^(0.5))) → intersection1
6. If(x(D) - x(C) ≤ r2 - r1, Min[a, b], r1^(2) * θ + r2^(2) * α - h * ((r1^(2) - h^(2))^(0.5) + (r2^(2) - h^(2))^(0.5))) → intersection2
7. If(r2 + r1 < x(D) - x(C), 0, If[r2 ≥ r1, intersection2, intersection1]) → IntersectArea
8. Midpoint(C, D) → E
9. Polygon((x(E) - φ^(0.5) / 2, y(E) - 1 / (2 * φ^(0.5))), (x(E) - φ^(0.5) / 2, y(E) + 1 / (2 * φ^(0.5))), (x(E) + φ^(0.5) / 2, y(E) + 1 / (2 * φ^(0.5))), (x(E) + φ^(0.5) / 2, y(E) - 1 / (2 * φ^(0.5)))) → poly1, f, i, j, k
10. Circle(D, r2) → p
11. Circle(E, 0.5641895835477563) → q
12. If(logooff < 4.5, 0, 2 * (logooff - 4.5)) → logooffopa