The set of all points in a given hyperspace that are at a given length from a given point.

A zorb; the work of zorbing, entering a zorbing ball, strapping into a harness, and rolling down a hill.

A mathematical object existing much more than three measurements, analogous on world because all things at first glance tend to be equidistant through the main point; a generalization of a sphere in more than three dimensions.

Equidistantial area.

In four-dimensional area, the three-dimensional quadric areas through the intersection of X5 = 0 and where is a three-dimensional area which will be fulfilled by any line of S4 in two things.

## How would you define hypersphere?