👉 In mathematics, a quadricrescentoid is a type of surface in three-dimensional space that has a curvature that is close to 0. This means that the distance from a point on the surface to a nearby point or line is very small compared to its distance from the center of the surface. For example, consider a sphere with radius r and centered at (x, y, z) in three-dimensional space. The equation of this sphere can be written as: (x - x0)^