任意圆锥

GeoGebra 命令及参数

1. Intersect(zAxis, xAxis) → A
2. PointIn(Plane[xAxis, zAxis]) → B
3. Distance(A, B) → r
4. Angle((1, 0, 0), A, B) → a
5. Surface((((r * cos(u)) * cos(a)) * v) + ((1 - v) * x(S)), ((r * sin(u)) * v) + ((1 - v) * y(S)), ((((sgn(z(B)) * r) * cos(u)) * sin(a)) * v) + ((1 - v) * z(S)), u, 0, (2 * π), v, 0, 1) → b
6. CurveCartesian(((r * cos(u)) * cos(a)), (r * sin(u)), (((sgn(z(B)) * r) * cos(u)) * sin(a)), u, 0, (2 * π)) → c