The list of factors in Euclidean four-space having the exact same distance R from a fixed level P0 kinds a hypersurface called a 3-sphere. The hyper-volume from the enclosed Place is:
Lagrange wrote in his Mécanique https://kiaraoxih549132.bloggip.com/29847436/the-smart-trick-of-tahta-4d-that-nobody-is-discussing